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【单选题】
在机械加工时，机床、夹具、刀具和工件构成了一个完事的系统，称为（）。A.
工艺系统
B.
设计系统
C.
加工系统
D.
编程系统
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皮皮学刷刷变学霸
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【简答题】HXD3电力机车制动控制司机控制器调速手柄为( )级,级间能平滑调节。
【单选题】Why did the author begin to doubt himself after the first year of his writing career?
A.
He wasn't able to produce a single book.
B.
He hadn't seen a change for the better.
C.
He wasn't able to have a rest for a whole year.
D.
He thought that he lacked imagination.
【单选题】Why did the writer begin this passage with a question?
A.
Because he wanted to catch the reader's attention.
B.
Because he wanted to have the readers guess the answer before reading.
C.
Because he wanted to sum up (概括) the topic of the passage.
D.
Because he wanted to make the reader understand him better.
【单选题】Why did he begin taking exercises?
A.
Because he planned to improve his health.
B.
Because he chiefly wanted to relax himself.
C.
Because he tried to reduce his body weight.
D.
Because he mainly wanted to build up his body.
【简答题】n. 职务相当的人;职能相当的物
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