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