---What does you brother do?       

----     .

A．He works very hard

B．He is outgoing and friendly

C．He is a shop assistant

D．He is tall with curly hair

110kV交联聚乙烯电缆金属护套的（）不满足要求时，可增加铜丝屏蔽层。

A.短路容量；

B.电磁屏蔽：

C.机械强度；

D.以上都不对。