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关注：1
2013-05-23 12:21
求翻译：接通电源前一定要注意正负极性是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
接通电源前一定要注意正负极性
问题补充： |
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2013-05-23 12:21:38
Before the power is important to note that positive and negative polarity
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2013-05-23 12:23:18
Before switching on the power must note polarity
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2013-05-23 12:24:58
Puts through in front of the power source certainly to have to pay attention to the positive and negative polarity
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2013-05-23 12:26:38
Before the power is important to note that positive and negative polarity
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2013-05-23 12:28:18
Before the power is important to note that positive and negative polarity
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