采用垂直接地极能减小接地系统的季节系数，起稳定接地系统安全性能的作用。
Adding vertical rods to grounding system will decrease the seasonal coefficient and stabilize the safety of grounding system.
在我国北方高寒冰冻地区接地系统的接地电阻季节系数可达3.0，接触电压和跨步电压季节系数可能达到10和5.4。
The seasonal coefficient of grounding resistance possibly reaches 3.0 in freezing region of North China, and those of touch voltage and step voltage 10 and 5.4, respectively.
该模型用于模拟发生严重荒漠化的鄂尔多斯高原植物群落的季节及年生长、叶片投影盖度、蒸发系数。
The model was developed to simulate seasonal and annual growth, foliage projective cover (FPC), and evaporative coefficient in the Ordos plateau, where serious desertification happened recently.
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