单项选择题

You can swing the derrick to starboard side or port side. But do not exceed （）for the union purchase.

A.120°
B.90°
C.60°
D.100°

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单项选择题

A. slacked off
B. taken in
C. send away
D. send out

单项选择题

A. slacked off
B. send away
C. taken in
D. send out

单项选择题

A. up and down
B. upwards or downwards
C. upside or downside
D. forwards and backwards