题目内容

The World Travel and Tourism Council says it usually takes 90 months for visitor numbers to recover after a virus outbreak.

A. 对
B. 错

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液压缸采用差动连接时，若使两个方向的运动速度相等，则活塞杆与活塞直径之间的关系是（）

A. d=0.5D
B. d=2/3D
C. d=D
D. d=0.707D

推力越大，液压缸的速度越大，即v=F/A 。

A. 对
B. 错

TASK B: Choose the correct responses.Who’s Shawn

A. The middle-aged man on the couch
B. That’s right

Where is Samantha

A. She couldn’t make it
B. I’d like to meet her