基本同步通讯 "basic synchronous communication 基本系统延伸 "basic system extension 基本电信存取方法 "basic telecommunications access method ..
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It points out the PLC design key is to satisfy the basic control function and the capacity, and maintenance convenience, the system extension and so on.
指出了PLC设计的关键主要是能满足基本控制功能和容量，并考虑维护的方便性、系统可扩展性等。
The funds shortage was the mainly problem of basic agricultural extension system, 78% of their funds have to rely on their own income generation activities for support of extension activities.
基层推广机构78%的运行费用要靠经营创收来解决，经费短缺问题已成为影响基层推广机构正常运转的最大问题。
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