單項選擇題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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1.單項選擇題The air cylinder bottles in the survival craft should be refilled with().

A.oxygen
B.nitrogen
C.compressed air
D.nitrogen and oxygen

2.單項選擇題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

3.單項選擇題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

5.單項選擇題Raw lacquer is()corrosive nature.

A.in
B.of
C.on
D.with