primary air造句

1、The NOx emission is high along with the great of primary air rate.
一次风率越大，氮氧化物排放量越大。

2、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。

3、Meanwhile, the control of air flow, furnace negative pressure and primary air flow are introduced.
同时也介绍了送风量、炉膛负压和一次风量的控制。