| ประโยคภาษาจีน : 中文句子 | 
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|  běn本  lùn wén论文  wéi rào围绕  tiě fǎ铁法  méi yè煤业  jí tuán集团  xiǎo kāng小康  kuàng矿  jí极  ruǎn软  yán céng岩层  yì易  zì rán自燃  hòu厚  méi céng煤层  kāi cǎi开采  de的  jì shù技术  nán tí难题  jìn xíng进行  le了  yán jiū研究 | 
| Research has been in progress round the technology difficult problem that mines in the thick coal seam of extremely soft rock and easy self-ignition of TieFa coal industry group by this thesis. |