單項(xiàng)選擇題Calcium carbide and acetone are counteractive()nature.

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


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題Argon is classified as a().

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

3.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

4.單項(xiàng)選擇題All of our export dangerous goods are()the standard.

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

5.單項(xiàng)選擇題All of our export dangerous cargo is()examined before shipment.

A.though
B.through
C.thorough
D.thoroughly