單項選擇題

（）(擺動)the derrick to shore side.

A.Top
B.Lower
C.Swing
D.Adjust

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單項選擇題

When the derrick is stopped, the guy must be （）(收好).

A.taken in
B.slacked off
C.adjusted
D.stowed

單項選擇題

When the derrick is topped, the guy must be （）(放松).

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