Firstly, this paper analyzes the Change process of Zhengzhou city since the beginning of the 20th Century, that is, the stage of stagnancy, starting, expansion, accelerating etc.
本文分析了郑州市20世纪初以来的城市演变过程，归纳出四个阶段，即停滞、起步、扩张和加速阶段；
To realize the auto-leveling control of draw frame during its start and stop process, a premise to solve this problem is to keep a steady speed change during the accelerating and decelerating process.
为解决并条机启、停过程的自调匀整控制，关键要实现启停机加减速过程的平稳变速。
To realize the auto-leveling control of draw frame during its start and stop process, a premise to solve this problem is to keep a steady speed change during the accelerating and decelerating process.
为解决并条机启、停过程的自调匀整控制，关键要实现启停机加减速过程的平稳变速。
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