电源电动势在数值上等于（）。
A.电源端电压
B.电源开路电压
C.负载两端电压
D.电源内压降
参考答案：B
—Daniel is good at physics and speaks fluent Chinese.
— ____________.
A．So is his brother
B．Nor does his brother
C．So it is with his brother
D．It is the same as his brother
号料方法大致有（）、（）、（）和（）。
