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【单选题】
下列不是造成机床一直处于急停状态不能复位的原因是A.
PLC程序编写错误
B.
防护门没有关紧
C.
伺服驱动器损坏
D.
电气方面原因
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反馈参考答案：
举一反三
【单选题】I can’t do the work by myself so I ________ a student to help me.
A.
need
B.
let
C.
start
D.
use
【单选题】-What’s wrong with your pen? -______. [ ]
A.
I can’t use it
B.
It doesn’t work
C.
I don't mind
D.
Never mind
【简答题】A．It doesn't include the use of dialect. B．It is considered Stowe's best written work. C．It was not published in the nineth century. D．It was Stowe' s most popular work.
【单选题】— Some factories now use ________ workers and ________ energy to finish their work than before. — How terrible! [ ]
A.
fewer; more
B.
less; less
C.
less; more
D.
more; fewer
【单选题】This machine doesn't ______. The workers have to use ______ one. [ ]
A.
work; another
B.
go; other
C.
use; the other
D.
run; others
【单选题】—Could I use your computer, Dad? —Sorry, you _____. I'm going to work on it. [ ]
A.
wouldn't
B.
can't
C.
needn't
D.
don't have to
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