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 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。
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。
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