The spare cable or control cable that is normally not loaded with current shall be placed at the center in case of multi-layer laying.
多层敷设时，平时不载流的备用电缆或控制电缆应放置在中心部位。
The paper introduces a computer-aid design for the multi-layer wrapping cable insulation which will be useful to select the optimal structure of the cable insulation.
本文涉及电缆多层绕包绝缘的计算机辅助设计，有助于电缆绝缘结构的最佳选择。
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