| 1. | Verification regulation of double tube mercury barometer
双管水银压力表检定规程 |
| 2. | Silver head ( with clock ) , double tubing with fittings bag
银色听头（带时钟） ,双管，配件包。 |
| 3. | Double tube mercury manometer
双管水银压力表 |
| 4. | Hung clamp for double tube
双管悬挂卡箍 |
| 5. | Double tube pressure gauge
双管压力计 |
| 6. | Double tube percolator
复管式渗漉器 |
| 7. | Double tube core barrel
复式岩心管 |
| 8. | Double tube catheter
双腔导管 |
| 9. | Normal double tube
普通双管 |
| 10. | Based on that , the paper applied the theories of fluid mechanics and mechanics of elasticity to the double tube telescopic damper , developed the mathematical model with 7 parameters for the first time
并在此基础上，应用流体力学和弹性力学的有关理论，针对双筒液力减振器首次提出了合理的7参数数学模型。 |
