题目内容

双作用气缸一般只采用排气节流调速。

A. 对
B. 错

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在气动不能满足工作要求的场合，可采用气液联动速度控制回路。

A. 对
B. 错

请为9月5日入库的这批小五金计算占地面积。

_____me tomorrow and I’ll let you know the lab result.

A. Calling
B. Call
C. To call
D. Having called

Today there are more airplanes _____more people than ever before in the skies.

A. carry
B. carrying
C. carried
D. to be carrying