转换开关;电话电键,互换电键

switch key的用法和样例：

例句

Change-over switch for voltage phase-changed measuring.电压换相测量转换开关。
The switch is a momentary contact one, with latching logic on the system module.转换开关是系统模块上使用拴锁逻辑的一个瞬时接触点。

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