primary emission

Exhaust emission of vehicle engines is one of the primary air pollution sources.

车用内燃机的废气排放是大气污染的主要污染源之一.

The distance between the acoustic-emission source and the receiving transducer, and the background noise level are primary factors in selecting a particular frequency band.

声发射源与接收讯号传感器间的距离以及环境噪声的电平是选择频带的主要依据。

Primary Strategy: This strategy aims to directly reduce carbon emission from company's operation.

主要策略: 本策略以直接从公司营运中减少碳排放量为目标.

Particulate concentration enrichment ( PCE) of primary air in pulverized-coal ( P-C) boilers is important to flame ignition, stabilization and low NOx emission.

一次风的浓缩有利于煤粉气流的着火、稳燃和降低NOx排放，是煤粉燃烧器一个主要任务。

The emission characters of election and ion is investigated, and combining the time-resolved of the charge with time-resolved intensity distribution of the continuum emission, Bremsstrahlung of electron is the primary mechanism of the continuum.

结合连续辐射强度的时空分布，讨论了激光诱导等离子体连续辐射的产生机理，认为连续辐射是以电子的轫致辐射为主要机制。