单项选择题
The gooseneck is （）. Stop using it at once.
A.bend
B.bent
C.band
D.bended
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A. work
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You can swing the derrick to starboard side or port side. But do not exceed （）for the union purchase.
A.120°
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D.100° -
单项选择题
When the derrick is lowered, the guys must be （）.
A. slacked off
B. taken in
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D. send out
