In order to facilitate the installation and maintenance of the electrical components in the principle of the connection point line often be marked with code.
为了安装以及检修的方便，在电气原理图中元件的连接点线往往都应该标有编号。
In order to facilitate the installation and maintenance of the electrical components in the principle of the connection point line often be marked with code.
为了安装以及检修的方便，在电气原理图中元件的连接点线往往都应该标有编号。
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