Drawing according to the electrical principal system chart provided by users.

按用户提供的电气原理图系统图绘制。

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Moreover, a method of analyzing the interference between electrical principal axis and the limbs is introduced.

主要对干涉约束进行了详细的分析与计算，提出了一种计算电主轴与驱动杆之间干涉的方法。

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The principal USES of PVC in North America, in order of importance, are pipes, construction materials, consumer goods, packaging, and electrical products (such as wire and cable insulation).

在北美，PVC的主要用途按重要性排列为管道、建筑材料、消费产品、包装纸和电器产品(比如电线和电缆绝缘)。

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