—Boy, 　　　　　　

　—It is, looks like spring is coming soon.

　—Yeh, It'll just be a few more weeks.

A．it's really a nice day today, isn't it?

B．what knid of weather are we going to have today?

C．do you think it is going to rain today?

D．what' it like outside today?

如果线路始端相电流的故障分量中，IC最大、IB和IA接近于零，则线路发生的故障是（）

A.B相单相接地

B.AC两相短路

C.AB两相短路接地

D.C相单相接地