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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用精馏分离某二元混合物系,若进料流量为5000kmol/h,轻组分x(F)=50%,要求塔顶产品x(D)≥95%,塔底产品x(w)≤5%,求塔顶、塔底的出料流量。
--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