An electric network for of clear layer, simple structure, standard connection, rational redundancy and appropriate advance technology is set up, "N-1" standard of city network is realized.
建立层次清晰、结构简单、接线规范、冗余度合理、技术适度超前的电网框架，实现城市电网“N - 1”准则。
The redundancy material defect is an important factor of reducing the yield of IC, it mainly causes circuits to be connection failure.
冗余物缺陷是影响IC晶片成品率下降的重要原因，主要造成电路短路错误。
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