A.byB.forC.intoD.withCan we change the location for the……

单项选择题Calcium carbide and acetone are counteractive（）nature.

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

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

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
D.toluene

单项选择题All of our export dangerous goods are（）the standard.

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