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单选题
Regular foam can be used on all but which flammable liquid?（）
A
Motor gasoline
B
Jet fuel
C
Crude petroleum
D
Alcohol
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单选题Which statement about firefighting foam is TRUE?（）A
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单选题A petroleum liquid has a flash point of 135°Fahrenheit. This liquid is classed as a grade （）.A
B flammable liquidB
C flammable liquidC
D combustible liquidD
E combustible liquid
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单选题A petroleum liquid has a flash point of 85°F. This is a grade （）.A
B flammable liquidB
C flammable liquidC
D combustible liquidD
E combustible liquid
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