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

Deballasting a double bottom has what affect on KG().

A.KG is increased
B.KG is decreased
C.Kgis not affected
D.KG increases at light drafts and decrease at deep drafts

微信掃碼免費搜題