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?（）.<br>A:In the lower level of the pumproom<br>B:In the middle level of the pumproom<br>C:In the upper lever of the pumproom<br>D:On the deck outside the pumproom

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 lever of the pumproom
D:On the deck outside the pumproom

出自：海船船员证

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