单项选择题
Calcium carbide and acetone are counteractive（）nature.
A.by
B.in
C.from
D.with
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相关考题
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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 -
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
