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

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单项选择题Argon is classified as a（）.

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

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

A.benzene
B.tar
C.middle oil
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单项选择题All of our export dangerous goods are（）the standard.

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

单项选择题All of our export dangerous cargo is（）examined before shipment.

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

单项选择题All handling and stowage of packaged hazardous materials on board a domestic vessel engaged in foreign trade shall be done under the supervision of（）.

A.a MSA Marine Inspector
B.an officer assigned to the vessel by MSA
C.a officer from CCS
D.the National Cargo Bureau