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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·This increases the initial primary air fan size and reduces the forced draft fan sizes.

这会增加一次风机的尺寸而减小从动风扇的尺寸。

4·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。

5·The test results show that it is feasible to shorten the length of guide plate in a primary air pipe duct.

结果表明，缩短一次风管道内导流板的长度是可行的。

6·The problem that the primary air leakage of trisector AH is large arises some domestic customers attention.

三分仓空气预热器一次风泄漏量偏大，引起国内部分用户的反响。

7·When the primary air blast wave from the explosion strikes the ground another blast wave is produced by reflection.

当爆炸引起的入射冲击波触及地面时，由于波的反射便产生另一冲击波。

8·The mixing point of primary air and secondary air of burner is a key parameter for the flame stabilization of fuel.

燃烧器一、二次风混合位置是燃烧着火稳燃的关键。

9·When the primary air blast wave from the explosion strikes the ground, another blast wave is produced by reflection.

当爆炸引起的入射冲击波触及地面时，由于波的反射便产生另一冲击波。

10·The curve of relationship between flame speeds and the primary air ratio is got, and when primary air ratio is about 0.

得出了二甲醚火焰传播速度与一次空气系数的关系曲线，并且在一次空气系数约为0。