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| 采煤广义:指煤炭生产过程的全部工作。狭义:指从采煤工作面采出煤炭的工序 | |||
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coal getting : 1 phrase in 1 subject |
| Technology | 1 |
The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Add | The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Report an error
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