锰粉单位表面积上的反应速度随反应时间的延长基本不变。
While the reaction rate in specific surface area of metalli…
在相同时间内，杨木单位表面积吸水量越多，其表面自由能越大。
The more the poplar of per unit area absorbed liquid, the more its surface free energy had in the same time.
比如探究气泡生长速率如何随气泡面的数目变化而变化，以及单位容量内使表面积最小化。
Those include uncovering how bubble growth rates vary with the number of bubble sides and minimizing the surface area per unit volume.
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