电源应接在变频器主回路R、S、T端子上。
参考答案：对
如图，R1和R2都是10Ω，开关闭合后，电压表示数是4.5V，则电流表A1的示数为_____A，电流表A2的示数为_____A。
—Did you go swimming last Sunday?
—No. We would have gone ______ nicer.
A．if the weather was
B．would the weather have been
C．had the weather been
D．should the weather be
