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單項(xiàng)選擇題

As compared to carbon dioxide,dry chemical has which advantage?（）.

A.Cleaner
B.Effective
C.Greater range
D.More cooling effect

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單項(xiàng)選擇題

As oil pipe line connections were broken,（）quantity of oil was caused to spill onto the wharf and into the dock water.

A.a not knowing
B.an unknowing
C.an unknown
D.a not known

單項(xiàng)選擇題

At the required fire drill conducted aboard a vessel, all person must report to their stations and demonstrate their ability to perform the duties assigned to them（）.

A.by the toolpusher
B.in the station bill
C.by the person conduction the drill
D.at the previous safety meeting

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