刚玉砖、高铝砖、碳砖等属于耐火材料的分类中的（）。

发电机按冷却方式分类，有（）。

A.汽轮发电机和内冷式发电机
B.外冷式发电机和内冷式发电机
C.外冷式发电机和汽轮发电机
D.空气冷却发电机和水冷却发电机

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A．He did not spend money freely.B．He was always well-dressed.C．He had a luxurious ear.D．He worked hard for a living. 点击查看答案