问题
单项选择题
What can be used to measure the percentage of oxygen inside a chain locker?（）
A.Flame safety lamp
B.Combustible gas indicator
C.Oxygen indicator
D.H2S meter
答案
参考答案：C
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What can be used to measure the percentage of oxygen inside a chain locker?（）
A.Flame safety lamp
B.Combustible gas indicator
C.Oxygen indicator
D.H2S meter
参考答案：C