单项选择题

Calcium carbide and acetone are counteractive（）nature.

A.by
B.in
C.from
D.with

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单项选择题

At sea，on what occasion would you display two red lights at night or two black balls during the day?（）.

A.When vessel is on fire
B.When vessel is not under command
C.When vessel is carrying the dangerous cargoes
D.When vessel is restricted in her ability to maneuver

单项选择题

Argon is classified as a（）.

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

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

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