单项选择题
在集合地点集合。（）
A. Meet in front of the muster station. B. Get hold of the ladder. C. Drop me a heaving line to lift my bag. D. A ship is made fast to the equipment by mooring lines.
单项选择题 救生艇下水每隔三个月进行一次。（）
单项选择题 Which letter means that oil-spilling has happened?（）
单项选择题 （）is best for electrical fire.
