By contrast, the paper calculated the reliability index of the abutment after changing variable quotiety of the stochastic variable. 作为对比，本文还在改变各随机变量变异系数的前提下，计算了坝肩岩体各高程的可靠指标。
In the model, shortages are allowed and the backorder rate is a random variable. 存货系统中允许缺货发生且为部分欠拨，欠拨率为一随机变数。
