— Is there anything else to discuss? — _
题型：选择题
问题：
— Is there anything else to discuss?
— __________. I guess. [ ]
A. Not at all
B. No, that's all
C. Yes, I'm sure
D. Yea, of course
题型：选择题
如图所示，理想变压器原副线圈匝数之比为4：1，原线圈接入一电压为u=220 sin100πtV的交流电源，副线圈接一个R=27.5Ω的负载电阻．则下述结论正确的是（ ）A．副线圈中电压表的读数为55V B．副线圈中输出交流电的周期为0.01s C．原线圈中电流表的读数为0.5A D．原线圈中的输入功率为110  |
W