单选题If the diesel fuel vapors present are within the flammable range （）.Athe vapor air mixture is too rich to burnBan explosion may occur if a source of ignition is presentCthe vapor air mixture is too lean to bum the upper explosiveDlimit has been exceeded
单选题
If the diesel fuel vapors present are within the flammable range （）.
A
the vapor air mixture is too rich to burn
B
an explosion may occur if a source of ignition is present
C
the vapor air mixture is too lean to bum the upper explosive
D
limit has been exceeded
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