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| 弹簧式自动断开机构; 弹簧式脱钩装置 | |||
| 弹簧避障器 | |||
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spring trip : 10 phrases in 4 subjects |
| Compressors | 1 |
| Drilling | 2 |
| Oil / petroleum | 1 |
| Technology | 6 |
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