2014年自学考试《高等数学(工本)》模拟预测试卷(5)

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20

下述各项正确的是   (  )

  • A.(1,-2,3)   
  • B.(1,2,-3)
  • C.(-1,2,3)   
  • D.(-1,-2,-3)
22

设向量α={2,1,-1)与y轴正向的夹角为β,则β满足 (   )

  • A.<img src="//img1.yqda.net/question-name/7d/5adf71ff0a5d22c7041055484652dd.jpg" alt="" />
  • B.<img src="//img1.yqda.net/question-name/a8/6ef13e0e82e4dca8eb4891a261b90b.jpg" alt="" />
  • C.<img src="//img1.yqda.net/question-name/7d/78329837c8b76c25bea6e94b4fcfb1.jpg" alt="" />
  • D.<img src="//img1.yqda.net/question-name/aa/ceb44e50be34bdc17e99ce95de387d.jpg" alt="" />
23

(1P2)在空问直角坐标系中,点P(-1,2,-3)关于Oyz坐标面的对称点是   ( )

  • A.(1,-2,3)&nbsp;&nbsp;&nbsp;
  • B.(1,2,-3)
  • C.(-1,2,3)&nbsp;&nbsp;&nbsp;
  • D.(-1,-2,-3)
24

  • A.<img src="//img1.yqda.net/question-name/9f/ace0974e52d0c5cae765f4be7145a0.jpg" alt="" />
  • B.<img src="//img1.yqda.net/question-name/58/efbd33470efaebdbaa74432ba35fc0.jpg" alt="" />
  • C.<img src="//img1.yqda.net/question-name/6f/50c57a4889ff166cf6eab046627654.jpg" alt="" />
  • D.<img src="//img1.yqda.net/question-name/7a/16baf3525283a6f2c58f0e987d6543.jpg" alt="" />
25

  • A.<img src="//img1.yqda.net/question-name/8f/484b6d9b2409bdf3461475d3f67ace.jpg" alt="" />
  • B.<img src="//img1.yqda.net/question-name/a4/4c204bfb1e1096c7f421fa9480b038.jpg" alt="" />
  • C.<img src="//img1.yqda.net/question-name/ea/754d6fff18dcf40b6b01324a047469.jpg" alt="" />
  • D.<img src="//img1.yqda.net/question-name/02/41f861b5c419401af20899ff9bcd03.jpg" alt="" />