These conclusions aid to measure drainage rate of gas and fixing on maintenance period of coal laneway.

这些结论对于检测煤层瓦斯抽放率以及合理确定煤巷的维护周期具有重要的参考价值。

youdao

These conclusions aid to measure drainage rate of gas and fixing on maintenance period of coal laneway.

这些结论对于检测煤层瓦斯抽放率以及合理确定煤巷的维护周期具有重要的参考价值。

youdao