This paper discusses the common troubles in use of PM4 controlling by electricity: 1. suspending of PM4 system; 2. mechanism next to the PM4 could not be controlled;
文中讨论了该支架采用的PM4电液控制系统在应用中常见的故障是：①PM4 系统网络中断；
This paper discusses the common troubles in use of PM4 controlling by electricity: 1. suspending of PM4 system; 2. mechanism next to the PM4 could not be controlled;
文中讨论了该支架采用的PM4电液控制系统在应用中常见的故障是：①PM4 系统网络中断；
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