重庆大学20春《高等数学（II-2）》第2次答案
《高等数学（II-2）》第2次1.[单选题]曲线 <img src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/0505b7cf-a9d3-46b8-8741-4de18f5f6b97/20140707212652.jpg" alt="" width="295" height="43" />在t=2处的切向量是（ ）。
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A.(2,1, 4)
B.(4,3, 4)
C.0
D.(?4,3, 4)
正确答案:——A——
2.[单选题]<img height="68" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/0d122d8b-c8b8-425d-b931-b0a98a81d358/20140707205548.jpg" width="96" border="0" alt="" />在 <img height="62" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/0d122d8b-c8b8-425d-b931-b0a98a81d358/20140707205557.jpg" width="117" border="0" alt="" /> )处<img height="89" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/0d122d8b-c8b8-425d-b931-b0a98a81d358/20140707205607.jpg" width="130" border="0" alt="" />均存在是<img height="67" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/0d122d8b-c8b8-425d-b931-b0a98a81d358/20140707205618.jpg" width="109" border="0" alt="" />在<img height="66" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/0d122d8b-c8b8-425d-b931-b0a98a81d358/20140707205626.jpg" width="120" border="0" alt="" /> 处连续的（）条件。
A.充分
B.必要
C.充分必要
D.既不充分也不必要
正确答案:——D——
3.[单选题]若满足<img src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/2a8a0eab-f856-4793-92bf-c4ac621cb86a/20140706205341.jpg" alt="" width="335" height="93" />，则交错级数 <img src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/2a8a0eab-f856-4793-92bf-c4ac621cb86a/20140706205355.jpg" alt="" width="235" height="96" />（ ）。
A.一定发散
B.一定收敛
C.可收敛也可发散
D.难以确定
正确答案:————
4.[单选题]设<img width="286" height="108" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/513e0bea-7ba4-460d-9dee-e930d43f99d9/20140709155725.jpg" /> ，当a=（）时<img width="404" height="105" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/513e0bea-7ba4-460d-9dee-e930d43f99d9/20140709155737.jpg" /> 。
A.1
B.<img width="93" height="101" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/513e0bea-7ba4-460d-9dee-e930d43f99d9/20140709155756.jpg" />
C.<img width="103" height="118" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/513e0bea-7ba4-460d-9dee-e930d43f99d9/20140709155804.jpg" />
D.<img width="108" height="115" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/513e0bea-7ba4-460d-9dee-e930d43f99d9/20140709155813.jpg" />
正确答案:————
5.[单选题]若级数 <img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/6fb4051a-05cc-4359-86f9-0cd9797844ce/20140710134226.jpg" width="252" height="73" alt="" /> 在<img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/6fb4051a-05cc-4359-86f9-0cd9797844ce/20140710134240.jpg" width="164" height="78" alt="" /> 处条件收敛，则级数<img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/6fb4051a-05cc-4359-86f9-0cd9797844ce/20140710134248.jpg" width="141" height="84" alt="" />（ ）。
A.条件收敛
B.绝对收敛
C.发散
D.不能确定
正确答案:————
6.[单选题]微分方程<img src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/700f1782-936a-45d3-9148-98d64765387a/20140706121826.jpg" alt="" width="129" height="87" />的通解是（ ）。
A.<img alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/700f1782-936a-45d3-9148-98d64765387a/20140706121838.jpg" width="219" height="89" />
B.<img alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/700f1782-936a-45d3-9148-98d64765387a/20140706121848.jpg" width="202" height="91" />
C.<img alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/700f1782-936a-45d3-9148-98d64765387a/20140706121902.jpg" width="199" height="79" />
D.<img alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/700f1782-936a-45d3-9148-98d64765387a/20140706121912.jpg" width="153" height="94" />
正确答案:————
7.[单选题]<img src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/7772448a-e838-4690-bf3a-1671a50f84bf/20140709165757.jpg" alt="" width="306" height="97" />与 <img src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/7772448a-e838-4690-bf3a-1671a50f84bf/20140709165806.jpg" alt="" width="323" height="96" />的大小关系为（ ），其中V是以点（1,1,1），（2,1,1），（1,2,1）和（1,1,2）为顶点的闭区域。
A.大于
B.小于
C.等于
D.不能确定
正确答案:————
8.[单选题]设<img height="63" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/c57f93f8-3aff-4337-bae4-47619d6c71e8/20140706131533.jpg" width="54" border="0" alt="" />是微分方程<img height="76" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/c57f93f8-3aff-4337-bae4-47619d6c71e8/20140706131541.jpg" width="286" border="0" alt="" />的解，<img height="68" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/c57f93f8-3aff-4337-bae4-47619d6c71e8/20140706131552.jpg" width="100" border="0" alt="" />是微分方程<img height="92" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/c57f93f8-3aff-4337-bae4-47619d6c71e8/20140706131602.jpg" width="288" border="0" alt="" />的 解，则（）是微分方程<img height="97" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/c57f93f8-3aff-4337-bae4-47619d6c71e8/20140706131615.jpg" width="366" border="0" alt="" />的解。
A.<IMG height=100 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/c57f93f8-3aff-4337-bae4-47619d6c71e8/20140706131638.jpg" width=121 border=0>
B.<IMG height=81 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/c57f93f8-3aff-4337-bae4-47619d6c71e8/20140706131645.jpg" width=120 border=0>
C.<IMG height=88 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/c57f93f8-3aff-4337-bae4-47619d6c71e8/20140706131653.jpg" width=71 border=0>
D.<IMG height=90 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/c57f93f8-3aff-4337-bae4-47619d6c71e8/20140706131703.jpg" width=66 border=0>
正确答案:————
9.[单选题]方程组<img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/d04a1573-329c-4468-895c-b476bd604b9a/20140707140003.jpg" width="426" height="80" alt="" /> 所表示的圆的半径为（）。
A.4
B.3
C.2
D.1
正确答案:————
10.[单选题]椭球面<img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/ee92367f-e663-4328-b7e4-a613549faacb/20140707172429.jpg" width="541" height="94" alt="" /> 的中心坐标是( )。
A.（?1,3，3）
B.（?1,3，?3）
C.（1,3，3）
D.（1,3，?3）
正确答案:————
11.[单选题]下列说法不正确的是（）
A.<IMG height=118 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/a923fcd4-1e5b-4a56-9b35-0f2f341a165a/20140706210753.jpg" width=276 border=0>
B.<IMG height=98 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/a923fcd4-1e5b-4a56-9b35-0f2f341a165a/20140706210803.jpg" width=565 border=0>
C.<IMG height=144 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/a923fcd4-1e5b-4a56-9b35-0f2f341a165a/20140706210823.jpg" width=178 border=0>
D.<IMG height=138 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/a923fcd4-1e5b-4a56-9b35-0f2f341a165a/20140706210844.jpg" width=194 border=0>
正确答案:————
12.[单选题]按牛顿冷却定律：物体在空气中冷却的速度与物体的温度和空气的温度之差成正比。已知空气温度为300C,而物体在15分钟内从1000C冷却到700C，求物体冷却到400C所需的时间为（ ）分钟。
A.50
B.51
C.52
D.53
正确答案:————
13.[单选题]当k =（）时,平面<img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/3dcf5853-27f4-4f4b-8b22-56716fe21568/20140710140509.jpg" width="281" height="83" alt="" />与<img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/3dcf5853-27f4-4f4b-8b22-56716fe21568/20140710140519.jpg" width="309" height="90" alt="" /> 互相垂直。
A.0
B.1
C.-1
D.3
正确答案:————
14.[单选题]为将方程<img height="84" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/622ec77c-e951-4f6d-8920-a6f7796786bc/20140706112849.jpg" width="344" border="0" alt="" />转化为可分离变量的微分方程，适当的变量代换是（ ）。
A.<IMG height=88 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/622ec77c-e951-4f6d-8920-a6f7796786bc/20140706112903.jpg" width=158 border=0>
B.<IMG height=97 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/622ec77c-e951-4f6d-8920-a6f7796786bc/20140706112910.jpg" width=123 border=0>
C.<IMG height=84 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/622ec77c-e951-4f6d-8920-a6f7796786bc/20140706112916.jpg" width=147 border=0>
D.<IMG height=87 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/622ec77c-e951-4f6d-8920-a6f7796786bc/20140706112923.jpg" width=152 border=0>
正确答案:————
15.[单选题]求解微分方程<img height="91" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/86170006-51f0-42ed-a300-6285c2e8cde0/20140706104101.jpg" width="292" border="0" alt="" />满足初始条件<img height="76" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/86170006-51f0-42ed-a300-6285c2e8cde0/20140706104116.jpg" width="152" border="0" alt="" />的特解的Matlab命令为( )。
A.y=dsolve ('Dy=(1+x)(1+siny)',’y(0)=2’,'x')
B.y=dsolve ('Dy=(1+x)*(1+sin(y))',’y(0)=2’,'x')
C.y=dsolve ('Dy=(1+x)(1+sin(y))',’y(0)=2’,'x')
D.y=dsolve ('Dy=(1+x)*(1+siny)',’y(0)=2’,'x')
正确答案:————
16.[单选题]直线<img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/a4342b0b-ed22-4be7-a3cd-625921c9d9b8/20140707170156.jpg" width="256" height="94" alt="" />与直线<img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/a4342b0b-ed22-4be7-a3cd-625921c9d9b8/20140707170208.jpg" width="216" height="102" alt="" />的夹角为（）
A.0°
B.45°
C.60°
D.90°
正确答案:————
17.[单选题]下面可以作为一条有向直线的方向角的是（ ）。
A.45°，60°，60°
B.30°，45°，60°
C.45°，90°，60°
D.0°，30°，150°
正确答案:————
18.[单选题]已知<img height="76" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/ae0335b3-a64f-4932-8077-71e5bdcc3f82/20140707195023.jpg" width="197" border="0" alt="" /> ，其中<img height="94" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/ae0335b3-a64f-4932-8077-71e5bdcc3f82/20140707195031.jpg" width="264" border="0" alt="" />均有一阶连续偏导数，则<img height="96" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/ae0335b3-a64f-4932-8077-71e5bdcc3f82/20140707195042.jpg" width="78" border="0" alt="" />=( )。
A.<IMG height=97 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/ae0335b3-a64f-4932-8077-71e5bdcc3f82/20140707195051.jpg" width=192 border=0>
B.<IMG height=83 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/ae0335b3-a64f-4932-8077-71e5bdcc3f82/20140707195057.jpg" width=253 border=0>
C.<IMG height=87 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/ae0335b3-a64f-4932-8077-71e5bdcc3f82/20140707195105.jpg" width=190 border=0>
D.<IMG height=107 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/ae0335b3-a64f-4932-8077-71e5bdcc3f82/20140707195112.jpg" width=270 border=0>
正确答案:————
19.[单选题]<img width="298" height="72" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/e104a31d-ac21-4104-8207-dfb4dae88adc/20140710131941.jpg" /> =-3， <img width="240" height="69" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/e104a31d-ac21-4104-8207-dfb4dae88adc/20140710131950.jpg" /> ，则 <img width="212" height="100" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/e104a31d-ac21-4104-8207-dfb4dae88adc/20140710131959.jpg" />( )。
A.1
B.0
C.8
D.不能确定
正确答案:———— 答案联系Q1647861640
20.[单选题]二元函数 <img width="128" height="95" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/ea98ccc7-0c43-45db-b7c1-3a9c34c48968/20140709102915.jpg" />在点<img width="142" height="88" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/ea98ccc7-0c43-45db-b7c1-3a9c34c48968/20140709102926.jpg" />处两个偏导数 <img width="353" height="125" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/ea98ccc7-0c43-45db-b7c1-3a9c34c48968/20140709102939.jpg" />存在是<img width="128" height="95" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/ea98ccc7-0c43-45db-b7c1-3a9c34c48968/20140709102915.jpg" />在该点连续的（ ）。
A.充分条件而非必要条件
B.必要条件而非充分条件
C.充分必要条件
D.既非充分条件又非必要条件
正确答案:————
21.[单选题]曲面<img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/ec545f16-c989-4c12-b8f4-7e244d0939f4/20140707144539.jpg" width="244" height="81" alt="" /> 是（）。
A.zox平面上曲线z=x绕z轴旋转而成的旋转曲面
B.zoy平面上曲线z=|y|绕z轴旋转而成的旋转曲面
C.zox平面上曲线z=x绕x轴旋转而成的旋转曲面
D.zoy平面上曲线z=|y|绕y轴旋转而成的旋转曲面
正确答案:————
22.[单选题]设f(x,y)是有界闭区域<img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/ecc7a037-1b7f-48ee-a542-8059a62a14e8/20140709160424.jpg" width="287" height="79" alt="" />上的连续函数，则当 <img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/ecc7a037-1b7f-48ee-a542-8059a62a14e8/20140709160434.jpg" width="137" height="78" alt="" />时，<img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/ecc7a037-1b7f-48ee-a542-8059a62a14e8/20140709160443.jpg" width="299" height="105" alt="" /> 的极限（）。
A.不存在
B.等于f(0,0)
C.等于f(1,1)
D.等于f(1,0)
正确答案:————
23.[单选题]幂级数 <img width="301" height="89" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/28f964cc-8b6f-43b5-8f6b-2cac8fc04f95/20140710134523.jpg" />的收敛半径为（ ）。
A.1
B.<img width="98" height="89" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/28f964cc-8b6f-43b5-8f6b-2cac8fc04f95/20140710134541.jpg" />
C.<img width="69" height="95" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/28f964cc-8b6f-43b5-8f6b-2cac8fc04f95/20140710134556.jpg" />
D.以上答案都不对
正确答案:————
24.[单选题]设幂级数<img height="70" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/a867483f-f9af-42fc-9cb3-e7bc3c05a37c/20140706212659.jpg" width="149" border="0" alt="" />在x=1处收敛，则级数在x=−1处（）
A.条件收敛
B.发散
C.绝对收敛
D.敛散性不定
正确答案:————
25.[单选题]点（0，0）是函数z=xy的（）。
A.驻点
B.极大值点
C.极小值点
D.间断点
正确答案:————
26.[单选题]点 <img height="51" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/7fec5754-616f-418d-af7c-b82ef1bab019/20140707214214.jpg" width="130" border="0" alt="" />是函数 <img height="66" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/7fec5754-616f-418d-af7c-b82ef1bab019/20140707214223.jpg" width="147" border="0" alt="" /> 的驻点，则（）。
A.P是<IMG height=54 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/7fec5754-616f-418d-af7c-b82ef1bab019/20140707214239.jpg" width=115 border=0>的极大值点
B.P是<IMG height=54 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/7fec5754-616f-418d-af7c-b82ef1bab019/20140707214239.jpg" width=115 border=0>的极小值点
C.P不是<IMG height=54 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/7fec5754-616f-418d-af7c-b82ef1bab019/20140707214239.jpg" width=115 border=0>)的极值点
D.不能确定P是否为<IMG height=54 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/7fec5754-616f-418d-af7c-b82ef1bab019/20140707214239.jpg" width=115 border=0>的极值点
正确答案:————
27.[单选题]级数 <img src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/d01cfb2c-f5e9-45fe-87eb-604389420ee5/20140706143350.jpg" alt="" width="231" height="114" />的敛散性为（ ）。
A.收敛
B.不能确定
C.可敛可散
D.发散
正确答案:————
28.[单选题]设 <img height="83" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/e2ca1823-a150-40f2-b268-20684473c7fc/20140706150355.jpg" width="156" alt="" /> 为正项级数，且 <img height="103" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/e2ca1823-a150-40f2-b268-20684473c7fc/20140706150405.jpg" width="200" alt="" /> ，则 <img height="107" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/e2ca1823-a150-40f2-b268-20684473c7fc/20140706150413.jpg" width="142" alt="" />( )
A.收敛
B.发散
C.敛散性不定
D.全部都不对
正确答案:————
29.[单选题]球面<img height="55" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/adc1ddac-9260-4b44-aced-02fbb415d237/20140707231113.jpg" width="192" border="0" alt="" /> 含在圆柱面<img height="64" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/adc1ddac-9260-4b44-aced-02fbb415d237/20140707231120.jpg" width="147" border="0" alt="" />内部的面积是（）。
A.<IMG height=49 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/adc1ddac-9260-4b44-aced-02fbb415d237/20140707231131.jpg" width=104 border=0>
B.<IMG height=53 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/adc1ddac-9260-4b44-aced-02fbb415d237/20140707231137.jpg" width=137 border=0>
C.<IMG height=68 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/adc1ddac-9260-4b44-aced-02fbb415d237/20140707231144.jpg" width=117 border=0>
D.<IMG height=76 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/adc1ddac-9260-4b44-aced-02fbb415d237/20140707231150.jpg" width=117 border=0>
正确答案:————
30.[单选题]<img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/dca6ef71-adba-4a2b-930c-e2b36d15b950/20140710112541.jpg" width="239" height="84" alt="" /> _____________，其中Γ为曲线<img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/dca6ef71-adba-4a2b-930c-e2b36d15b950/20140710112551.jpg" width="368" height="85" alt="" />上相应于t从0变到2的这段弧。
A.<IMG border=0 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/dca6ef71-adba-4a2b-930c-e2b36d15b950/20140710112603.jpg" width=210 height=98>
B.<IMG border=0 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/dca6ef71-adba-4a2b-930c-e2b36d15b950/20140710112612.jpg" width=205 height=91>
C.<IMG border=0 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/dca6ef71-adba-4a2b-930c-e2b36d15b950/20140710112620.jpg" width=200 height=103>
D.<IMG border=0 alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/dca6ef71-adba-4a2b-930c-e2b36d15b950/20140710112627.jpg" width=215 height=105>
正确答案:————
31.[判断题]向量 <img width="122" height="64" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/15742102-4af1-4812-827e-ee1b996b0739/20140706230606.jpg" />，<img width="146" height="74" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/15742102-4af1-4812-827e-ee1b996b0739/20140706230614.jpg" /> ，<img width="103" height="66" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/15742102-4af1-4812-827e-ee1b996b0739/20140706230621.jpg" />且c垂直于b，则 <img width="88" height="76" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/15742102-4af1-4812-827e-ee1b996b0739/20140706230633.jpg" />。（ ）
A.正确
B.错误
正确答案:————
32.[判断题]已知a= (1，1，1)，b= (1,2,2)，则和向量a与b都垂直的单位向量是<img width="119" height="105" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/3eae55b8-8e60-46f8-a91c-56519094f810/20140706232207.jpg" /> 。（ ）
A.正确
B.错误
正确答案:————
33.[判断题]过点（2，0，－1）且与直线x=t－2,y=-3t+1,z=－2t+3垂直的平面方程是x－3y－2z–4=0。（）
A.正确
B.错误
正确答案:————
34.[判断题]微分方程<img height="86" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/879d0f53-7ed6-480f-8d43-6a0bb19e57b2/20140706130351.jpg" width="215" border="0" alt="" /> 满足初始条件<img height="85" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/879d0f53-7ed6-480f-8d43-6a0bb19e57b2/20140706130402.jpg" width="260" border="0" alt="" />的特解为<img height="78" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/879d0f53-7ed6-480f-8d43-6a0bb19e57b2/20140706130412.jpg" width="288" border="0" alt="" /> 。（）
A.正确
B.错误
正确答案:————
35.[判断题]y=<img width="262" height="81" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/c4db97c7-12bd-4ad9-8713-0e3cc5fb65a5/20140706125341.jpg" />是微分方程 <img width="232" height="81" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/c4db97c7-12bd-4ad9-8713-0e3cc5fb65a5/20140706125350.jpg" />的通解。（ ）
A.正确
B.错误
正确答案:————
36.[判断题]一条曲线满足其切线在纵轴上的截距等于切点的横坐标，则该曲线的方程为<img height="98" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/d5decdae-4212-47f3-846a-e3d3ed0653a2/20140706115120.jpg" width="240" border="0" alt="" />。( )
A.正确
B.错误
正确答案:————
37.[判断题]设函数<img width="110" height="66" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/d73ac6d2-4544-4013-967f-659b1f1af0ec/20140707211522.jpg" />，则<img width="163" height="74" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/d73ac6d2-4544-4013-967f-659b1f1af0ec/20140707211530.jpg" />。（ ）
A.正确
B.错误
正确答案:————
38.[判断题]设平面区域<img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/7a20ea25-da45-4370-a0f9-616fef2357d6/20140709162113.jpg" width="384" height="85" alt="" />，则二重积分 <img border="0" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/7a20ea25-da45-4370-a0f9-616fef2357d6/20140709162123.jpg" width="386" height="97" alt="" />。( )
A.正确
B.错误
正确答案:————
39.[判断题]微分方程<img height="102" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/fdfe96f4-340b-4b2f-8fb7-f7328af3d534/20140706122013.jpg" width="260" border="0" alt="" />的通解是<img height="101" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/fdfe96f4-340b-4b2f-8fb7-f7328af3d534/20140706122023.jpg" width="387" border="0" alt="" />。（）
A.正确
B.错误
正确答案:————
40.[判断题]设 <img width="279" height="86" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/0e476e9c-a414-47e1-ae53-0f47d4bdac88/20140707211612.jpg" /> ，则 <img width="221" height="101" alt="" src="http://file.5any.com/UniversityV4.0/CourseProblem/c010b0bc/0e476e9c-a414-47e1-ae53-0f47d4bdac88/20140707211620.jpg" />。（ ）
A.正确
B.错误
正确答案:————
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