单项选择题
Ship’s steering gear refers to（）.
A.cargo handling machines B.deck winches and derricks C.engine-room tools D.course controlling system
单项选择题 Shell plating is（）.
单项选择题 Regulations require that access to a cargo pumproom in a tanker carrying grade D liquid cargo，shall be（）.
单项选择题 Prior to magnetic particle inspection of anchor chain，the chain should be（）.
