The natural gas in Ke-Yi tectonic belt is from coal measures.
依奇克里克原油的煤系成分大于克拉苏构造带原油。
In accordance with affect factor of big block coal and raise technical measures.
针对大块煤率的影响因素提出了技术措施。
The State shall take special protective measures for miners working in underground coal mines.
国家对煤矿井下作业的职工采取特殊保护措施。
The State shall take special protective measures for miners working in underground coal mines.
国家对煤矿井下作业的职工采取特殊保护措施。
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