现在让我们来考虑下必要性问题，假设A发生了情况，A可能是某台球对另一台球的撞击运动。
But now lets think about this necessity , suppose A happens, A might be the motion of one billiard ball towards another.
主要介绍了北台球墨铸铁管厂退火炉时序脉冲燃烧控制系统的组成、控制原理和动态性能，指出时序脉冲燃烧控制方式的优点以及在引进应用中应注意的问题。
The composition, control principle and dynamic characteristics of time series pulse combustion control system applied to the annealing furnace in Beitai Ductile Cast Iron Pipe Plant are introduced.
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