单项选择题
As a sailor on duty you must know how to （）(调整)derricks.
A. taken in
B. slack off
C. adjust
D. send out
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There are many （）(类型)of ship’s cargo handling equipment.
A.types
B.kind
C.series
D.type -
单项选择题
When the derrick changes its （）(角度), its lifting capacity changes correspondingly.
A.angel
B.length
C.height
D.angle -
单项选择题
The derrick can’t be （）(超载).
A.exceeded
B.overloaded
C.overtaken
D.loaded
