单项选择题
A.示波器B.函数信号发生器C.万用表D.交流毫伏表
A.12VB.-24VC.-12VD.24V
A.15VB.12VC.-15VD.5V
A.Uo =0.9U2B.Uo =1.2U2C.Uo =0.45U2D.Uo =U2
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