()分析可以帮助我们进行()齿轮的失效形式。
参考答案:边频带;诊断
The manager says he needs an assistant that he can________to deal with the problems that may occur in
his absence. [ ]
A. depend
B. turn up
C. count up
D. count on
以下4个选项中哪一个不是温室效应产生的主要原因?()
A.弗利昂
B.破坏森林
C.太阳黑子活动频繁
D.各国工业迅速发展