Diesel fuel vapors （）.<br>A:can not be ignited by a spark unless the vapor is in a confined space<br>B:are nontoxic in all concentrations<br>C:can not be ignited by a spark unless they are at their auto-ignition temperature<br>D:are heavier than air

Diesel fuel vapors （）.
A:can not be ignited by a spark unless the vapor is in a confined space
B:are nontoxic in all concentrations
C:can not be ignited by a spark unless they are at their auto-ignition temperature
D:are heavier than air

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