单词：normal open
normal open的用法和样例：
例句
- The second method uses a small permanent magnet to hold normally open contacts together.第二种方法是采用小的永久磁铁使常开触点闭合在一起。
单词：normal open 相关文章
nod----------点头 navel-------- 小说 North-------北方 normal------正常的
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