高压设备的一次方案图及选用电器元件和参数；
High-pressure equipment used at a program plan and electrical components and parameters;
成套电器的一次方案设计排列图在成套电器生产企业中占有重要的地位，提高一次方案排列图设计的正确性及效率非常必要。
Primary circuit scheme design of electrical apparatus is an important procedure in electrical apparatus manufactory, it is necessary to improve validity and efficiency of this procedure.
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