| 1. | Several different types of valves are in use. some are back pressure valves .
有几种不同的阀在使用中，有些是反向压力阀。 |
| 2. | Diplegs play an important role as pressure seals against the considerable back pressure generated .
料腿则起着对产生的相当大的背压加压密封作用。 |
| 3. | Increase back pressure and lower screw rotation speed
增加背压和降低螺杆转速 |
| 4. | The effect of which back pressure to the performance of safety valve
背压对安全阀性能的影响 |
| 5. | Application of shuttle back pressure valve in fluid transportat ion
梭式止回阀在流体输送中的应用 |
| 6. | Increase back pressure or melt temperature
增加背压和熔化温度 |
| 7. | Back pressure of steam trap
蒸汽系统疏水器出口外凝结水的压力 |
| 8. | Back pressure saturation method
室内土工试验反压饱和法 |
| 9. | And the back pressure of 18kg cm
的锅炉一台， |
| 10. | Maximum operating back pressure
最高工作背压 |
