單項(xiàng)選擇題The (auto)ignition temperature is that temperature atwhich().

A.no spark or flame is required to ignite gas or vapor
B.a fuel begins to give off explosive vapors
C.a fuel if ignited will continue to burn
D.a 1% mixture of the fuel with air will explode


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1.單項(xiàng)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

3.單項(xiàng)選擇題Raw lacquer is()corrosive nature.

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

5.單項(xiàng)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