單項選擇題Sulfuric acid is a().

A.clear syrupy liquid with no odor
B.colorless-to-brown liquid with a choking odor when hot
C.colorless liquid with a pleasant fruity odor
D.whitish liquid with a faint,pleasant odor


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2.單項選擇題Raw lacquer is()corrosive nature.

A.in
B.of
C.on
D.with

4.單項選擇題Outlets in gasoline fuel lines are().

A.permitted for drawing fuel samples
B.permitted for draining fuel from lines
C.permitted for bleeding air from lines
D.prohibited

5.單項選擇題Many dangerous cargoes are stowed on deck because of the().

A.danger to crew and cargo
B.necessity of periodic inspection
C.possible need to jettison
D.All of the above