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问题 单项选择题

肖特基(Schottky)型空位表示形成______的无序分布缺陷。

A．等量的阳离子和阴离子空位

B．双空位

C．等量的间隙阳离子和间隙阴离子

答案

参考答案：A

选择题

Both he and his wife work full time, but he refuses to        the housework.  [ ]

A. work with    

B. help with  

C. feel like    

D. pay for
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选择题

I wonder ______ that my children have picked up such words.

A．that it is

B．where is it

C．where it is

D．it is where
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