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| 厚壁钻杆 | |||
| 厚壁墙 | |||
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heavy wall : 17 phrases in 6 subjects |
| Drilling | 5 |
| Hydroelectric power stations | 1 |
| Mechanics | 1 |
| Metallurgy | 7 |
| Oil / petroleum | 2 |
| Space | 1 |
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