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。

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It shows the basic configuration, function and control characteristic.

说明了基本配置、功能和控制特点。

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The article describes the basic principle, control hardware configuration, technical parameter and function of flux leakage test.

简要叙述漏磁探伤的基本原理，介绍它的控制系统硬件结构，技术参数和具体功能。

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Greenwald: There are in the world two basic ways you control human behavior and have societies function.

FORBES: Intelligent Investing