问题
单项选择题
Which may ignite fuel vapors?（）
A.Static electricity
B.An open and running motor
C.Loose wiring
D.All of the above
答案
参考答案：D
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Which may ignite fuel vapors?（）
A.Static electricity
B.An open and running motor
C.Loose wiring
D.All of the above
参考答案：D