Where possible, the closed position should be determined by leak test using water or air, under lowpressure.
如果可能的话，可以用水或空气，在低压状态下，对关闭状态进行测试，看看有没有泄漏。
2
The performance of turbocharged diesel engines at different high altitudes was studied on the engine test bed for simulating high altitude (lowairpressure).
在内燃机高海拔(低气压)模拟试验台上，对不同模拟海拔高度下的涡轮增压柴油机性能进行了试验研究。
3
Optics and optical instruments - environmental test methods - combined cold, lowairpressure.