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【单选题】
关于硬切削,( )描述是不正确的。A.
硬切削是指对硬度为HRC45以上高硬材料进行的切削加工
B.
硬切削需要专用工具、专用机械和夹具
C.
硬切削技术的发展在很大程度上得益刀具材料的出现及发展
D.
硬切削是一种“以切代磨”的新工艺，是一种高效切割技术
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【简答题】党的纪律包括____、____、廉洁纪律、群众纪律、________ 和生活纪律。
【单选题】—You look upset. What’s the matter? —I had my proposal again.
A.
turning down
B.
turned down
C.
to turn down
D.
turned to
【单选题】听力原文：W：You look upset．Anything wrong? M：I failed in the physics exam again in spite of all the efforts I made． Q：What do we know about the man from the conversation? (15)
A.
He didn't work as hard as he was supposed to.
B.
He didn't pass the physics exam.
C.
He did better in an earlier exam.
D.
He found something wrong with the exam.
【简答题】设等比数列 的前 项和为 ,已知 则 的值为 ．
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