单项选择题
What is not usually a concern when loading a single-hulled tanker?（）
A.Bending moments B.Initial stability C.Draft D.Trim
单项选择题 The two points that act together to trim a ship are the（）.
单项选择题 The TPC curve，one of the hydrostatic curves in a vessel’s plans，gives the number of tons（）.
单项选择题 The Plimsoll mark on a vessel is used to（）.
