97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区 狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久

單項選擇題

A facility used for the discharge of a cargo of a particular hazard,such as chlorine,butane or ethane,must have what to warn water traffic of an immediate danger during fire or cargo release?()

A.An emergency boat and crew
B.A siren or rotating flashing light
C.Flashing red lights located one-half mile upstream and downstream of the facility
D.Buoys with flashing lights controlled from shore,located one-half mile upstream anddownstream of the facility

微信掃碼免費搜題