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| bumper jar; bumper sub; drill jar; jar bumper; jar knocker; knocker; shock sub | |||
| jar | |||
| bumper jar (事故处理用) | |||
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| jars | |||
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震 击 器 : 70 phrases in 5 subjects |
| Drilling | 27 |
| Electronics | 1 |
| Mechanics | 1 |
| Oil / petroleum | 37 |
| Technology | 4 |
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