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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?().

单选题
2021-08-20 12:40
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
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正确答案
D

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