英语词汇“switch pretravel”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	switch pretravel
释义	switch pretravel switch pretravel [′swich ′prē‚trav·əl] (electricity) That movement of a switch-operating level that takes place before the switch is actuated either to close or to open its contacts.
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