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單項選擇題

As a sailor on duty you must know how to （）(調(diào)整)derricks.

A. taken in
B. slack off
C. adjust
D. send out

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單項選擇題

There are many （）(類型)of ship’s cargo handling equipment.

A.types
B.kind
C.series
D.type

單項選擇題

When the derrick changes its （）(角度), its lifting capacity changes correspondingly.

A.angel
B.length
C.height
D.angle

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