A.8~12B.10~12C.12~50D.4~6
A.100~150B.60~80C.50~100D.230~325
A.高壓瓦斯壓力B.瓦斯壓力、地壓、煤巖性質(zhì)C.瓦斯壓力、地壓、瓦斯含量D.瓦斯壓力、煤巖性質(zhì)、瓦斯含量