【单选题】已知R1,R2,R3三电阻串联在电路中,R1的端电压为10V,R2的端电压为20V,R3的端电压为30V,则三个电阻的总电压为()
【单选题】— Mum, Must I do my homework first today? — No, you _____. You _____ watch TV or play with your friends, too. [ ]
【单选题】To be a good teacher, you need some of the gifts of a good actor: you must be able to 【C1】______ the attention and interest of your students; you must be a 【C2】______ speaker, with a good, strong, 【C3...
【单选题】已知电阻 R1 , R2 , R3 三电阻串联在电路中, R1 的端电压为 10V , R2 的端电压为 20V , R3 的端电压为 30V ,则三个电阻的总电压为( ) V 。