Instability index: An index which measures the variability of world prices for selected agricultural commodities.
不稳定指数：一种用于衡量部分农产品的国际价格变动的指数。
The less the instability index, the more stable its colloidal structure is, correspondingly, the stronger its aging resistance.
胶体不稳定指数越小，胶体结构越稳定，抗老化性能越好；
Considering the sensitivity of virtual nodal voltage to line reactance and variation of reactive power of power grid comprehensively, the voltage instability index is put forward.
综合考虑节点电压关于线路电抗和系统无功功率变化的灵敏度，提出了电压失稳指标。
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