单项选择题
Before the operation of the derrick, check all （）(索具)closely and everything must be in good condition.
A.blocks B.goosenecks C.tackle D.guys
单项选择题 The（）(地脚货) must be bagged.
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.
