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排 放 阀 : 40 phrases in 14 subjects |
Automobiles | 11 |
Aviation | 8 |
Compressors | 2 |
Drilling | 1 |
Earth sciences | 1 |
Electronics | 4 |
Engineering geology | 2 |
General | 1 |
Metallurgy | 1 |
Oil / petroleum | 3 |
Shipbuilding | 1 |
Space | 2 |
Steel production | 1 |
Technology | 2 |