单项选择题
A.comes directly over the bow B.comes directly over the stern C.comes over an area extending from broad on the bow to the quarter D.has no effect on the vessel
A.the man has been missing for a period of time B.the sea water is very cold and the man is visible C.there is thick fog D.the wind was from astern on the original course
A.correct trim will be obtained more easily B.drag effect will be cancelled out C.side forces will be eliminated D.speed will be increased