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【简答题】
设计夹具夹紧机构时,必须首先合理确定夹紧力的三要素: 、 和
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反馈参考答案：
举一反三
【单选题】______ has already been pointed out, only by correcting mistakes, can you make progress.
A.
It
B.
As
C.
That
D.
What
【单选题】The book came out in 1973 and it _________into thirty languages ever since.
A.
translated
B.
has been translated
C.
has translated
D.
was translated
【单选题】A new ______ to teaching languages is being used here, and it has turned out to be very helpful to the students.
A.
approach
B.
means
C.
method
D.
way
【单选题】The air has leaked out of this football. Could you get it________up? [ ]
A.
blow
B.
blowing
C.
blown
D.
to blow
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