题目内容

某燃烧炉中层使用绝热砖作为防护。若该绝热砖热导率为0.15W/(m·K),厚度为0.5m,其内侧温度为900℃,其外侧温度不高于100℃,求每平米绝热砖的最小散热速率?

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--Look at the children in the lake. They are playing happily. Let’s , too.Good idea.

A. go hiking
B. go camping
C. go boating
D. go sightseeing

The traffic is heavy. with your children in the street.

A. Not play
B. No play
C. Don’t play
D. No playing

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