单项选择题
A vessel moored with two anchors,sometimes, at an exposed roadstead to（）.
A.aid turing the ship B.obtain a fine bearing C.increase ship swing to wind or tide D.lighten the stress of anchor chains
单项选择题 A vessel’s bottom will be subjected to tension when weight is concentrated（）.
单项选择题 A vessel’s quarter is that section which is（）.
单项选择题 A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.
