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單項(xiàng)選擇題

Another name for coal naphtha that would appear on a dangerous cargo manifest is（）.

A.benzene
B.tar
C.middle oil
D.toluene

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單項(xiàng)選擇題

Any vessel in need of carring out deck washing must be（）by the department concerned beforehand.

A.requested
B.allowed
C.approved
D.inquired

單項(xiàng)選擇題

Argon is classified as a（）.

A.corrosive
B.flammable gas
C.flammable liquid
D.nonflammable gas

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