发布时间:2025-02-04 22:49:26
用。单芯是指在一个绝缘层内只有一路导体。当电压超过35kV时,大多数采用单芯电缆,线芯与金属屏蔽层的关系,可看作一个变压器的初级绕组中线圈与铁芯的关系。400的铜单芯电力电缆套400定额用乘以单芯系数。系数(外文名coefficient),是指代数式的单项式中的数字因数。
瓷砖以次充好如何赔偿就是购买双a品质砖厨房用墙砖最后送来的是每块砖上有一铅笔尖样的黑点或气泡
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