单选题Vessels required to be equipped with an approved backfire flame arrester are（）.Athose with diesel enginesBall those with gasoline enginesCthose with large engines onlyDNone of the above
单选题
Vessels required to be equipped with an approved backfire flame arrester are（）.
A
those with diesel engines
B
all those with gasoline engines
C
those with large engines only
D
None of the above
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