A. release a lifebuoy B. release a life-jacket C. release a lifeboat D. release a life-raft
单项选择题人员落水()
A. man overboard B. man aboard C. overboard man D. man on board
单项选择题发警报()
A. sound alarm B. make alarm C. send alarm D. receive alarm
单项选择题公共场所()
A. place B. common place C. private place D. public place
单项选择题救生圈()
A.lifebuoy B.lifeboat C.life-raft D.life-jacket
单项选择题救生设备()
A. life-jacket B. lifeboat C. lifebuoy D. life-saving equipment