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| 采空区; 竭采区 | |||
| 采竭地区; 已开采过地区 | |||
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| 排气管断面面积 | |||
| 排气面积; 排汽面积 | |||
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exhausted area : 7 phrases in 3 subjects |
| Aviation | 3 |
| Electronics | 2 |
| Space | 2 |
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