coal extraction的意思|示意

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coal extraction相关短语

1、 Coal Extraction with Solvents 煤的溶剂萃取

2、 safety coal extraction 安全回采

3、 end slope coal extraction 端帮采煤

4、 coal wall coal extraction 煤壁回采

5、 coal winning coal extraction 回采

6、 Coal extraction subsidence area 采煤塌陷地

7、 Coal extraction and utilization 煤炭开采利用

8、 subsidence land of coal extraction 采煤塌陷地

9、 subsidence lands of coal extraction 采煤塌陷区