单项选择题
The original equilibrium position is stable when（）.
A.metacentric height is positive B.metacentric radius is positive C.KG exceeds maximum allowable limits D.free surfaces are excessive
单项选择题 The remote control for a fixed fire extinguishing system should be（）.
单项选择题 The sign used to caution persons approaching the gangway of a tank barge during cargo transfer reads（）.
单项选择题 What is not accepted as the required shipping paperson a manned and loaded tank barge?（）.
