單項選擇題Can we change the location for the tung-oil()that for the gum rosin?

A.by
B.for
C.into
D.with


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

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

2.單項選擇題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

3.單項選擇題Argon is classified as a().

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

5.單項選擇題All of our export dangerous goods are()the standard.

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