《工程数学2387》18春在线作业2-0001

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A:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061123/be7d0796.JPG”></IMG>
B:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061123/4cc0b2ca.JPG”></IMG>
C:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061123/6069b646.JPG”></IMG>
D:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061123/6496815d.JPG”></IMG>

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A:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061123/35dba3b5.JPG”></IMG>
B:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061123/a565b1fc.JPG”></IMG>
C:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061123/53439a02.JPG”></IMG>
D:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061123/a088e0c6.JPG”></IMG>

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A:a=-1,b=2,c=-2
B:a=-2,b-1,c=2
C:a=2,b-1,c=-2
D:a=2,b=-2,c=-1

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A:不是，6
B:是，  6
C:不是，0
D:是，  0

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A:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061123/a86e4bfc.JPG”></IMG>
B:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061123/b453e846.JPG”></IMG>
C:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061123/b453e846.JPG”></IMG>
D:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061123/30284a39.JPG”></IMG>

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A:1
B:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061020/280f1655.JPG”></IMG>
C:0
D:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061020/d04f14a8.JPG”></IMG>

定长矢量与其导矢之间满足的关系是
A:相互平行
B:相互垂直
C:大小相等
D:垂直且大小相等

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A:0
B:1
C:2
D:4

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A:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061020/0b6170b0.JPG”></IMG>
B:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061020/729c9503.JPG”></IMG>
C:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061020/41eb7f31.JPG”></IMG>
D:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/singleselect/jiaoxuecd/20061020/1dca362e.JPG”></IMG>

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A:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/multiselect/jiaoxuecd/20061123/51da1c45.JPG”></IMG>
B:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/multiselect/jiaoxuecd/20061123/60ab0c20.JPG”></IMG>
C:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/multiselect/jiaoxuecd/20061123/7560c16b.JPG”></IMG>
D:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/multiselect/jiaoxuecd/20061123/dc59e646.JPG”></IMG>

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A:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/multiselect/jiaoxuecd/20061123/be7d0796.JPG”></IMG>
B:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/multiselect/jiaoxuecd/20061123/4cc0b2ca.JPG”></IMG>
C:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/multiselect/jiaoxuecd/20061123/6069b646.JPG”></IMG>
D:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/multiselect/jiaoxuecd/20061123/6496815d.JPG”></IMG>

下面的概念是矢量的是
A:梯度
B:散度
C:旋度
D:方向导数

下面描述正确的是
A:调和场的旋度为0
B:调和场的散度为0
C:调和场的梯度为0
D:调和场的旋度和散度有可能不全为0。

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A:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/multiselect/jiaoxuecd/20061020/86ee9b15.JPG”></IMG>
B:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/multiselect/jiaoxuecd/20061020/bf9ce0de.JPG”></IMG>
C:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/multiselect/jiaoxuecd/20061020/1212977b.JPG”></IMG>
D:<IMG SRC=”http://file.open.com.cn/Lms/ItemDBAttachments/image/multiselect/jiaoxuecd/20061020/705be2b1.JPG”></IMG>

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A:错误
B:正确

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A:错误
B:正确

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A:错误
B:正确

3、        单位阶跃函数不满足狄利克雷条件，但是正、余弦满足狄利克雷条件。
A:错误
B:正确

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A:错误
B:正确