1. The lowering hermetical state of an engine will not only cause economy and power coastdown, but also worsen the emission evaluating indicators of exhaust gas.

2. This approach can contribute to the hermetical treatment of keeping humid and anti-seepage, as well as good supporting effect.

3. It has characteristic of hermetical components can adjust and replace, reliable hermetic capability etc.

4. T. Pomatehko, experimental coefficients of hermetical pressure are simulated and can be used in cryogenic seal structure designing.

5. Meanwhile, the structure , hermetical method and general application of the transmitter are introduced.

5.

6. The author introduced the construction character and hermetical principle and application in practice of multiple arrangement metal and hard hermetical gas butterfly value.

7. The novel and hermetical structure is suitable for operation under the states of both positive and negative pressure.

8. Oil gutter structure on the export axle of retarded mechanism and hermetical piece are coordinated for gas isolated.

9. Cylinder compression pressure is an important parameter for measuring the hermetical state of an engine.

10. The applied examples show that magnetic coupler achieves the non-contacting and hermetical drive without any leakage at the conditions of high-pressure or high-vacuum, etc.

11. The applied examples show that the magnetic coupler can achieve the non-contacting and hermetical drive without any leakage under the condition of high-pressure, ultrahigh-pressure, vacuum, etc.