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| safety joint; safety sub | |||
| safe joint; safety coupling | |||
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安全接头 : 26 phrases in 7 subjects |
| Automobiles | 2 |
| Drilling | 5 |
| Electronics | 1 |
| Mechanics | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 12 |
| Technology | 4 |
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