– Kate and John got married last week.

-- Are you kidding? They have _____ in common.

A．anything

B．something

C．everything

D．nothing

电力变压器按（）分类，有铜线变压器、铝线变压器及半铜半铝、超导等变压器。

A．电源相数

B．用途

C．导电材质

D．冷却方式