【判断题】
A、u=100sin(50πt+30°)V B、u=141.4sin(50πt+30°)V C、u=200sin(100πt+30°)V D、u=141.4sin(100πt+30°)V
A、u=100sin(50πt+30°)V B、u=141.4sin(50πt+30°)V C、u=200sin(100πt+30°)V D、u=141.4sin(100πt+30°)V