单项选择题 Load line regulations are designed to insure that a vessel has adequate structural strength and sufficient（）.

单项选择题 In the absence of external forces，the center of gravity of a floating vessel is located directly above the（）.

单项选择题 If the vertical center of gravity (VCG) of a ship rises 1.7 feet，the righting arm (GZ) for the various angles of inclination will（）.