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

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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（）.

A.no spark or flame is required to ignite gas or vapor
B.a fuel begins to give off explosive vapors
C.a fuel if ignited will continue to burn
D.a 1% mixture of the fuel with air will explode

单项选择题

Sulfuric acid is a（）.

A.clear syrupy liquid with no odor
B.colorless-to-brown liquid with a choking odor when hot
C.colorless liquid with a pleasant fruity odor
D.whitish liquid with a faint，pleasant odor