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單項(xiàng)選擇題

There is a smell of gas in the hold. You must wear your （）(氧氣面罩).

A. fire mask
B. breathing apparatus
C. life-jacket
D. fire drill

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單項(xiàng)選擇題

Prepare for （）(棄貨) cargo.

A.jettisoning
B.lowering
C.hoisting
D.abandoning

單項(xiàng)選擇題

Post two lookouts with （）(望遠(yuǎn)鏡).

A.binoculars
B.mask
C.sextant
D.VHF

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