单项选择题
A.lifesaving equipment
B.stability
C.mooring tension
D.riser tension
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（）.
单项选择题 From（）the information concerning the tons per inch or centimeter immersion of a vessel shall be usually found.