问题
单项选择题
What is LEAST likely to cause ignition of fuel vapors?（）.
A.Static electricity
B.An open running electric motor
C.Loose wiring
D.Explosion proof lights
答案
参考答案：D
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What is LEAST likely to cause ignition of fuel vapors?（）.
A.Static electricity
B.An open running electric motor
C.Loose wiring
D.Explosion proof lights
参考答案：D