單項選擇題

Argon is classified as a（）.

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

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單項選擇題

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

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

單項選擇題

All of our export dangerous goods are（）the standard.

A.on
B.over
C.up to
D.above of