variances变通variancen.不一致；变化；[数]方差Variance-time plots method方差时间图法variance reduction technique方差减少技术variance work-in-process[经] 在产品差异variance from standard method标准差异法variance-reducing technique方差缩减技术variance component estimation方差分量估计variance of construction time工期延误率variance of voltage deviation电压偏移分散variance of a random variable随机变量的方差variance between laboratories组间方差