---- Lin Zhiying is 39 years old. But he looks even _____ than a college student.

---- Yes, he is one of my _____.

A．young; favorite singer

B．younger; most favorite singer

C．youngest; favorite singers

D．younger; most favorite singers

一般测量接地电阻，都是利用工频电流进行测量的，但雷击电流实际是高频高压的。所以接地装置的泻放电流效果要用它的（）来表示。冲击接地电阻Rch的定义是：接地装置上引出雷电流处的电压最大值与流经该接地装置雷电流最大值之比。

A、接地电阻

B、冲击接地电阻

C、接地电感

D、冲击接地电感