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單項選擇題

If you wear extra clothing when entering the water after abandoning ship it will（）.

A.weigh you down
B.preserve body heat
C.reduce your body heat
D.make it more difficult to breathe

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單項選擇題

If,during helicopter refueling operations,fuel is spilled on clothing,the person should first（）.

A.see the medic immediately
B.spray hinself with foam or CO
C.complete his task and then see medic
D.remove the clothing and wash

單項選擇題

In 1978,21989 vessels,including warships（）through the Suez Canal.

A.passed
B.passes
C.pass
D.past

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