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问题 填空题

水在定压下被加热可从未饱和水蒸气变成过热蒸汽，此过程可分为三个阶段：预热阶段、汽化阶段、过热阶段；其中包含的状态有（）；（）、湿饱和蒸汽、干饱和蒸汽、过热蒸汽

答案

参考答案：未饱和液体、饱和液体

单项选择题 B型题

釉质发育不全的是（）

A.特纳牙

B.壳状牙

C.哈钦森牙

D.诞生牙

E.氟牙症
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选择题

—Mummy, could you buy me a dress like this?

—Certainly. We can buy ______ one than this, but________ this

A．a better, better than

B．a worse, as good as

C．a cheaper, as good as

D．a more expensive, not as good as
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