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單項選擇題

Cargoes which（）an explosive，inflammable，poisonous and corrosive nature are called dangerous goods.

A.is
B.are of
C.is of
D.are

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Can we change the location for the tung-oil（）that for the gum rosin?

A.by
B.for
C.into
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單項選擇題

Calcium carbide and acetone are counteractive（）nature.

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

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