The characteristics of agroforestry systems microclimate are: (1) Component values of heat balance are positive in day time but negative at night.
农林系统的小气候特征是：(1)热量平衡的各分量白天为正值，夜间为负值。
A heat balance gives the temperature of solids at any time.
从热量衡算可以得到固体颗粒任何时候的温度。
The balance between the maximum reaction rate and the heat transfer capacity of the reactor was the key factor for shortening of polymerization time and improving the production capacity.
最大聚合速率与聚合釜传热能力的均衡是达到缩短聚合时间、提高生产能力的重要环节。
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