PVA Ported Vacuum Advance

The ignition-distributor vacuum-advance mechanism advances the spark during part-throttle operation.

分电器点火真空提前装置在节气门部分开启期间，使火花提前发出。

vacuum-controlled ignition advance

真空控制式点火提前

vacuum advance control valve

真空点火提前控制阀

vacuum automatic spark advance device

真空式自动提前点火装置

"On the full-vacuum-control distributor, the spark advance should be checked and adjusted, as necessary. The distributor should be lubricated periodically."

必须对全真空控制分电器的点火提前装置进行检查和调整,分电器也应定期进行润滑保养。

Measures Research of Utility-type Unit Condenser Vacuum Improvement;

大型电站凝汽器真空提高的方法研究

Process research of icrowave-vacuum drying for Chinese herbs extracts

中药提取物的微波真空干燥工艺研究

MEASURES FOR ENHANCING VACUUM IN OPERATION OF CONDENSER

300MW机组提高凝汽器运行真空的措施

Study on defluorination for purifying phosphoric acid by vacuum steam stripping

真空汽提法脱氟净化湿法磷酸的研究

Improving vacuum in BEPCⅡ synchrotron radiation ring with titanium sublimation pump

用钛升华泵提高BEPCⅡ同步辐射环真空度

A Research of the Causes of the Vacuum Leak in Steam Turbine and of Measures of Improvement;

汽轮机真空系统漏空原因及提高严密性的措施

Simulation and optimization of the suction system of vacuum sweeper with a front-mounting dust collection box

前装卸式真空清扫车吸尘系统仿真与优化

Simulation of Surface Charging Phenomena on Insulator Prior to Flashover in Vacuum

真空中绝缘子闪络前表面带电现象的仿真研究

vacuum-assisted front disc

真空助力式前轮盘式制动器

Connect all previously removed vacuum hoses.

连接所有以前拆去的真空软管。

In a vacuum, gamma rays travel in straight lines with the speed of light.

真空中，γ射线以光速沿直线前进。

The absoluteness of vacuum standard deteriorates with lowering of its pressure.

随着真空度的提高，真空度计量标准的绝对性越来越下降；

The Influence and Improving Measures of Water Jet Condensation Vacuum Pump on Vacuum Drying System

水喷射真空冷凝泵对真空干燥系统的影响及提高措施