单选题A pumproom is suspected of accumulating gases after a ventilation machinery breakdown. Where should the combustible gas indicator case be placed when testing the pumproom atmosphere for combustible gases?（）.AIn the lower level of the pumproomBIn the middle level of the pumproomCIn the upper level of the pumproomDOn the deck outside the pumproom
单选题
A pumproom is suspected of accumulating gases after a ventilation machinery breakdown. Where should the combustible gas indicator case be placed when testing the pumproom atmosphere for combustible gases?（）.
A
In the lower level of the pumproom
B
In the middle level of the pumproom
C
In the upper level of the pumproom
D
On the deck outside the pumproom
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