选择题:You ______ all those calculations. We have a compu

题目内容:
You ______ all those calculations. We have a computer to do that sort of thing.
A. must not have done B. should not have C. can not have done D. needn’t have done
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17. 能将液压能转换成机械能的液压元件是( )。(本题3.0分)A. 液压泵B. 液压缸C. 单向阀D. 都不行

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23.下述材料中哪一个归属优质碳钢( )。(本题2.0分)A. 1Cr13B. 20.0C. 1Cr

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Once the students started to talk, the discussion

Once the students started to talk, the discussion became so _______ that no one

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16. 学前儿童理智感已有明显的发展的突出表现是( )。(本题2.0分)A. 幼儿很喜欢做游戏B. 幼儿很喜欢提问题C. 幼儿已能控制自己的不愉快情绪D. 幼儿

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