发布时间:2025-02-05 00:03:27
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。
(江南叶 立体剪花威尔顿机织欧式地毯 复古红 140*200cm)-适用对象
2025-02-05 00:03:27 2025-02-05 00:03:27 2025-02-05 00:03:27 2025-02-05 00:03:27 2025-02-05 00:03:27 2025-02-05 00:03:27我在的山泉水如果给人下老鼠药农药要用什么才能过滤掉我家的泉水的源头住着一神经病人经常发
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