题11图所示正弦电流电路发生谐振时，电流和的大小分别为4A和3A，则电流的大小应为（）A。
A.7
B.1
C.5
D.0
参考答案：C
直角三角形斜边上的中线等于7.5cm，则斜边的长度为 cm。
— Health is money.
— But I think it is money. [ ]
A. as important as
B. more important than
C. so important than
D. the same as
