单项选择题
A.0.01A;5V B.0.1A;50V C.1A;500V D.1A;50V
A.1A和100V B.0.1A和10V C.0.01A和1V D.0.01A和10V
A.220V.100W B.220V.60W C.24V.100W D.24V.60W