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【单选题】
关于硬切削,描述不正确的是( )A.
硬切削是指对硬度为HRC45以上高硬材料进行切削加工
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于超硬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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【单选题】As a teenager, Mary sent newspapers in the morning, worked in a restaurant in the afternoon, and ______ in the evening.
A.
typing for her mother
B.
had typed for her mother
C.
typed for her mother
D.
to type for her mother
【单选题】下列信号中属于遇险信号的是______。 1由无线电示位标发出的信号;2两臂侧伸,缓慢而重复地上下摆动;3以雾号器具连续发声。
A.
①
B.
①②
C.
②③
D.
①②③
【简答题】听下面一段材料，回答第1-3题。 1. Which flight does the man have to take? A. The night. B. The afternoon. C. The morning. 2. Why does the man have to take it? A. To meet somebody. B. To attend a conference. C. To a...
【单选题】32 The two ferry disasters occurred
A.
at noon．
B.
in the morning.
C.
at night．
D.
in the afternoon．
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