单词：packed bed
packed bed的用法和样例：
例句
- Heat transfer coefficients in a packed bed have been investigated by Leva and Beck.填充床的传热系数已由利瓦和贝克作过研究。
- All investigators in mass transfer assumed plug flow of gas in packed beds.所有传递问题的研究者都假定在填充床层中的气体为活塞流。
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