单项选择题
The air cylinder bottles in the survival craft should be refilled with（）.
A.oxygen B.nitrogen C.compressed air D.nitrogen and oxygen
单项选择题 The (auto)ignition temperature is that temperature atwhich（）.
单项选择题 Sulfuric acid is a（）.
单项选择题 Sometimes charter-party expressly prohibit the loading of dangerous goods，but sometimes a Charterer is entitled by an express term to load them provided that due notice is given （）.
