单项选择题
A. bagged cargo B. delicate cargo C. sweepings D. inboard cargo
As a sailor on duty you must know how to （）(调整)derricks...
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
There are many （）(类型)of ship’s cargo handling equipment...
单项选择题There are many （）(类型)of ship’s cargo handling equipment.
A.types B.kind C.series D.type
When the derrick changes its （）(角度), its lifting capaci...
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
