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当前学科:水电自动装置检修工(高级技师)
题目:
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振荡频率与时间常数RC无关的多谐振荡器是()。
A . A、石英晶体振荡器
B . B、自激多谐振荡器
C . C、施密特触发器
D . D、555定时器
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