题目内容

采用二层胎体增强材料时,上下层不得( )铺设。

A. 平行
B. 相互垂直
C. 逆向
D. 以上皆可

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体增强材料短边搭接宽度不得小于( )mm。

A. 80
B. 70
C. 60
D. 50

After listening to the conversation above, choose the best answer.What are the speakers doing ?

A. Discussing a new project
B. Chatting about their work
C. Participating in a job interview
D. Arranging a sales meeting

Choose the best answer.What does the man's present job involve?

A. Selling audio products
B. Designing speakers
C. Launching new video games
D. Supervising company management

细胞膜在静息情况下,离子通透性最大的是

A. K+
B. Na+
Cl-
D. Ca2+

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