单项选择题
The Captain ordered the dangerous cargo on deck（）to lighten the ship and minimize the risk at sea.
A.be jettisoned B.be dropped C.be dived D.be abandoned
单项选择题 The air cylinder bottles in the survival craft should be refilled with（）.
单项选择题 The (auto)ignition temperature is that temperature atwhich（）.
单项选择题 Sulfuric acid is a（）.
