【单选题】
可燃气体释放源处于封闭或局部通风不良的半敞开厂房内，每隔( )可设一台检（探）测器，且检（探）测器距其所覆盖范围内的任一释放源不宜大于___。
A. 15m,7.5m
B. 10m,5m
C. 7m,3m
D. 20m,11m
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3___
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4___
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4___
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2___
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4___
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【单选题】
1___
A. About an hour.
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【单选题】
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【单选题】
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