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(xiàng)選擇題

At night you observe a vessel ahead show three flashes of a white light. This signal indicates that the vessel ahead is().

A.in distress
B.approaching a bend in the channel
C.operating astern propulsion
D.intending to overtake another vessel

微信掃碼免費(fèi)搜題