煤矿区 meaning in Chinese

coal district

Environment pollution and cleaning techniques at coal mine
煤矿区环境污染与洁净技术
Discussion on use of cmm to produce hydrogen
煤矿区煤层气制氢技术的探讨
Heavy metals in soil contaminated by coal mining activity
采矿活动对煤矿区土壤中重金属污染研究
Explore of coal mining area resource recycling industry chain
煤矿区资源循环利用的产业链构建探讨
Coal mining area environmental protection and clean mining technique
煤矿区环境保护与清洁开采技术

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