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

When backing down with sternway,the pivot point of a vessel is().

A.about one-quarter of the vessel's length from the stern
B.at the bow
C.about one-third of the vessel's length from the bow
D.aft of the propellers

微信掃碼免費(fèi)搜題