单项选择题
Topside icing decreases vessel stability because it is usually off-center and（）.
A.increases displacement B.increases the height of the center of gravity C.increases draft D.reduces the pocketing of free surface
单项选择题 The proximity of pack ice may be indicated by（）.
单项选择题 Small floes of rough，hummocky sea ice capable of damaging a vessel（）.
单项选择题 On a twin-screw，twin-rudder vessel，the most effective way to turn in your own water，with no way on，is to put（）.
