A typical Mathematica user develops code in their standard notebook interface, a programming concept that defines their input code and output results, including graphics.
典型的Mathematica用户在他们标准的Notebook界面中开发代码，Notebook界面是一个编程概念，它定义了输入代码和输出结果，包括图形。
Research purposes: the purpose was to make readers to learn the basic instruction, control way, programming concept and programming method through the analysis of several control programmes of PLC.
研究目的：通过对几个PLC控制程序的分析，使读者了解PLC程序的基本指令、控制方式和编程思想，初步掌握PLC的编程方法。
Research purposes: the purpose was to make readers to learn the basic instruction, control way, programming concept and programming method through the analysis of several control programmes of PLC.
研究目的：通过对几个PLC控制程序的分析，使读者了解PLC程序的基本指令、控制方式和编程思想，初步掌握PLC的编程方法。
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