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【简答题】
机械静联接又可以分为 联接和 联接,其中键联接、螺纹联接、销联接属于 连接。
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反馈参考答案：
举一反三
【简答题】Engineers had a better choice of material, ______________ (当新发明被投入使用以后).
【单选题】After synthetic ____, engineers had a better choice of material.
A.
created
B.
has created
C.
has been created
D.
had been created
【单选题】After synthetic ____, engineers had a better choice of material.
A.
created
B.
has created
C.
has been created
D.
had been created
【单选题】Mr. H never gets beyond corporal and material ________.
A.
verities
B.
value
C.
profit
D.
benefit
【单选题】If a better material______, the cost of the product would have been decreased.
A.
had been used
B.
had been using
C.
being used
D.
using
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