Diesel fuel vapors （）.
- Acan not be ignited by a spark unless the vapor is in a confined space
- Bare nontoxic in all concentrations
- Ccan not be ignited by a spark unless they are at their auto-ignition temperature
- Dare heavier than air
问题
Diesel fuel vapors （）.
参考解析：
分类：船舶电气与船舶安全题库
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