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| 大巷为整个开采水平或阶段服务的水平巷道 | |||
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| 坑口; 矿口 | |||
| 坑〔矿〕口 | |||
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| 矿井口; 矿坑口 | |||
| pit heading: 7 phrases in 1 subject |
| Technology | 7 |
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