The paper introduces the basic concept, parallel implementation and functional clement of parallel programming languages.
本文介绍并行的程序设计语言的基本概念、并行执行以及功能要素。
It starts with basic concepts of programming, and is carefully designed to define all terms when they are first used and to develop each new concept in a logical progression.
首先介绍的是一些编程的基本内容，给出概念和解释，然后循序渐进地深入讲解每个概念。
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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