Firstly, the paper investigate the actuality and the developing trend of PLC control system, then put forward the study direction of this paper.
本论文首先对PLC系统的现状和发展趋势进行了相关调研，进而提出了本次课题的研究方向。
Based on the basic theory of electrospun nanofibers, the text analyzed its infection factors, introduced the domestic and overseas actuality, application field and developing direction.
本文从静电纺丝的基本原理出发，分析了其影响因素。并对静电纺丝的国内外研究状况、应用领域及发展趋势做了全面的介绍。
Based on the basic theory of electrospun nanofibers, the text analyzed its infection factors, introduced the domestic and overseas actuality, application field and developing direction.
本文从静电纺丝的基本原理出发，分析了其影响因素。并对静电纺丝的国内外研究状况、应用领域及发展趋势做了全面的介绍。
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