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A safe fuel system must（）.

A.prevent engine overheating
B.have proper air/gasoline fuel mixture ratio
C.be liquid- and vapor-tight
D.supply sufficient air to the intake manifold

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A petroleum liquid has a flash point of 135°Fahrenheit. This liquid is classed as a grade （）.

A.B flammable liquid
B.C flammable liquid
C.D combustible liquid
D.E combustible liquid

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A synonym for chloroform is（）.

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A safe fuel system must（）.

A petroleum liquid has a flash point of 135°Fahrenheit. This liquid is classed as a grade （）.