单项选择题

A synonym for chloroform is（）.

A.trichloromethane
B.sulfuric chlorohydrin
C.chlorine gas
D.4-methyl phenol

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A.prevent engine overheating
B.have proper air/gasoline fuel mixture ratio
C.be liquid- and vapor-tight
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单项选择题

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

A.B flammable liquid
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C.D combustible liquid
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A flame screen（）.

A.permits the passage of vapor but not of flame
B.prevents the passage of flammable vapors
C.prevents inert gas from leaving a tank
D.permits vapors to exit but not enter a tank