【单选题】Water will evaporate from any wetted surface. A .significantly large fraction of the rainfall that falls on land is returned to the atmosphere in this fashion. In addition water is assimilated by root...
A.
the evaporated and transpired water from the earth itself
【判断题】任一组分的摩尔分数也可以用该组分的分压与混合物总压的比值表示。It can be seen from the above equation that the molar fraction of any component can also be expressed by the ratio of the partial pressure of the component to the total ...
【单选题】If a particular perfectly competitive industry uses only a small fraction of the supply of any of its inputs, the long run supply curve for that industry will tend to be: