【单选题】【消耗次数:1】
直线CD在水平投影面上的投影反映实长,因此称之为( )。<img src=https://huaweicloudobs.ahjxjy.cn/0D8E5E16CD6410977CFF2ABFD085E1D3.png title=图片2.png alt=图片2.png style=width: 351px; height: 171px; width=351 height=171/>
正平线
水平线
侧垂线
侧平线
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相关题目
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随机题目
【单选题】 His parents did not approve of his plan to go and study abroad with a girl they had never met, but he ____ and married her.
①  went against
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③  went for nothing
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【单选题】 They ____ that the aging population is adding 1 per cent yearly to health service costs.
①  add
②  calculate
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【单选题】 Our hopes ___ and fell in the same instant.
①  aroused
②  arose
③  raised
④  rose
【单选题】 In Africa, educational costs are very low for those who are ____ enough to get into universities.
①  ambitious
②  fortunate
③  aggressive
④  substantial
【单选题】 There were some ____ flowers on the table.
①  artificial
②  unnatural
③  false
④  unreal
【单选题】 This is the nurse who ____ to me when I was ill in hospital.
①  accompanied
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③  entertained
④  shielded
【单选题】 、Although he had looked through all the reference material on the subject, he still found it hard to understand this point and her explanation only ____ to his confusion.
①  extended
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【单选题】 Because women often ____ their diet to control weight, they may not consume enough iron-rich food, and are liable to experience a deficiency.
①  restrict
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③  stuck
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【单选题】 He was such a ____ speaker that he held our attention every minute of the three-hour lecture.
①  specific
②  dynamic
③  heroic
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【单选题】 Radio, television and press ____ of conveying news as information.
①  are the most common three means
②  are the most three common means
③  are the three most common means
④  are three the most common means