The two brothers are twins, but their character is not            to each other. One is kind, and the other is rude. [ ]

A.similar

B.familiar

C.near

D.the same

为了解决带钢温度均匀性和废气浓度的问题，现在许多红外线加热炉都是采取辐射与对流换热并用的（）方式

A.双金属层

B.鼓泡

C.综合固化

D.晶核数目