The exhaust gas ingredients of pulse engines, with five different combustion chamber volumes, throttle valve at small, middle and wide opening positions respectively, are tested.

对五种不同燃烧室体积的脉冲发动机在小、中和大油门开度三种供油条件下测定其排放物。

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The steam turbine drivers are warmed by slowly opening the exhaust valves.

汽轮机驱动器通过缓慢打开排气阀加热。

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If the exhaust system is under a vacuum, the casing must be warmed by gradually introducing the steam, after opening the exhaust valve.

如果排气系统处于真空下，必须在打开排气阀后，逐渐引蒸汽来加热壳体。

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And with each cycle of growth, and each cycle of financial constraints, we endemically and serially exhaust easy and cheap mines, and then under-invest in finding and opening new ones.

FORBES: Magnetic North: The Canadian (Mining) Miracle