题干
The TV station was _______by the new government as soon as the war ended.
A：taken u
B：taken out
C：taken i
D：taken over
答案(点此获取答案解析）
D
A：taken u
B：taken out
C：taken i
D：taken over
定义为外电路电阻消耗的功率与电源的总功率之比.在测电源电动势和内电阻的实验中得到的实验图线如图所示，图中U为路端电压，I为干路电流，a、b为图线上的两点，相应状态下电源的效率分别为
、
.由图可知
