For the engine particle emission measurement test, exhaust dilution system is mandatory.

在发动机颗粒排放测试过程中, 排气稀释系统是必备的设备.

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The influence of falling height, air relative humidity and mass flow on particle emission was determined.

通过实验主要测定下落高度 、 空气湿度和质量流量对粉尘排放的影响.

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