单词：reverse polarity
reverse polarity的用法和样例：
例句
- Reversed polarity indicates the weldment connected to welding machine negative polarity.反接是工件接电源负极。
- Polarity is inherent in a magnet.极性是磁铁的固有性质。
- The polarity can be reversed,standard size.极性可反转或变换，标准尺寸。
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