波纹管膨胀节的正确选型设计，对于管网的稳定和安全运行十分重要。
Selecting right type of expansion joints plays a very important role in running pipe network.
本文介绍了对主轴滚动轴承的力分析和如何正确选型的问题。给设计或改造提供了计算依据。
Force analysis of main shaft roller bearing of pan nodulizer and the knowhow of type selection are involved, which supplies as the calculation basis for the designs or modifications.
随着可编程控制器在石油化工自动化控制中的应用越来越广泛，PLC的正确选型在实际工作中显得非常重要。
With the extensive use of PLC in the automatic control systems in petrochemical industry, correct selection of PLC in the actual work is of great important.
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