铝制件。注：外绝缘用的胶片可以配套供应。
Material is aluminium. Note: the material for insulation can be supplied.
这种差异一直是电力系统外绝缘设计的关键问题之一。
This difference is one of the key question in the design of the external insulation.
这种差异一直是电力系统外绝缘设计的关键问题之一。
This difference is one of the key question in the design of the external insulation.
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