It is showed that LF48 - type polymerizer was the best selection for medium or small scale PVC enterprises, and had substituted for LF30 - type PVC polymerizer.
实践证明：LF48型PV C聚合釜是目前中小型规模PVC生产厂的首选釜型，已逐渐取代LF30型PV C聚合釜。
The second part is case studies of present situation and urban planning of China's medium or small-scale cities, aiming at finding out their roots of decentralized layout.
其次是对中国中小城市现状及规划实例的分析，针对中欧城市的差异及中国中小城市现状建设的问题，总结出我国中小城市布局分散化的根源。
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