单选题What is the best instrument for establishing a safe working area before welding in a confined space? （）AAn oxygen indicatorBA combustible gas indicatorCA combination combustible gas and oxygen indicatorDA flame safety lamp
单选题
What is the best instrument for establishing a safe working area before welding in a confined space? （）
A
An oxygen indicator
B
A combustible gas indicator
C
A combination combustible gas and oxygen indicator
D
A flame safety lamp
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