单项选择题 When a ship in loaded condition floats at arbitrary water line, its displacement is to the relevant mass of water displaced by the ship（）

单项选择题 Propulsion engines and the vast majority of auxiliary generator engines are designed to allow a generous through-flow of scavenge air in order to control （）

单项选择题 The ship emergency plan item should not include （） Ⅰ.ifesaving,fire fighting, leakage blocking, abandon ship Ⅱ.irst aid Ⅲ.ntegration emergency