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| 21. | hydraulic pressure stand tube |
| 液压支架管 |
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| 22. | hydraulic pressure treatment |
| 液压处理 |
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| 23. | hydraulic pressure zero |
| 液压对零 |
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| 24. | a hydraulic pressure gauge |
| 液压计 |
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| 25. | hydraulic pressure pumping tester |
| 水压泵试验机 |
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| 26. | hydraulic pressure differential packer |
| 水力压差式封隔器 |
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| 27. | hydraulic back pressure valve |
| 水保险器 |
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| 28. | pressure loss hydraulic calculatio |
| 液压消耗计算方法 |
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| 29. | operating hydraulic line pressure |
| 液压管路工作压力 |
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| 30. | high pressure universal hydraulic vice |
| 液压增力平口钳 |
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