A.foam and water
B.CO2 and dry chemical
C.dry chemical and water
D.foam and CO2
第1题
A.being compressed
B.to be pumped up
C.is pressurized
D.are built up
第2题
A.allow impurities to settle out of the fuel
B.allow air to escape from the fuel
C.make fuel available for immediate use
D.all of the above
第3题
A.water
B.fresh air
C.oils
D.gases
第4题
A.throughput
B.additive percent
C.cetane number
D.TBN number
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