单项选择题
The grab rail of a metal lifeboat is normally located（）.
A.along the turn of the bilge B.along each side of the keel C.near the top of the gunwale D.at the bow and at the stern
单项选择题 The governor brake shall be capable of controlling the speed of lowering a fully equipped lifeboat with its complement of persons on board at（）.
单项选择题 The first treatment given to a person overcome by benzene vapor should be to（）.
单项选择题 The FIRST treatment for a surface burn is to（）.
