... systematic study 系统研究 systematic variance 系统方差 systematization 系统化 ...
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系统误差协方差矩阵Q Covariance matrix Q of system error
系统样本的方差估计值 variance estimates for systematic samples
并指出在GIS数据中如何估计系统方差和置信系数，是需要深入研究和解决的难题。
We can get its estimating methods sparately and aclvance how to estimate system variance and confidence coefficient are problems that are need further researches.
这个计算方法，根据给定的系统随机输入的统计特征，可计算各犁铧耕深的方差、发动机转速和扭矩的方差。
With this method the depth variance of plow, the variance of the revs and the torque of engine can be calculated, according to the given characteristic of stochastic disturbance.
根据接触悬挂系统中的接触线振动方程，推导了接触线应力的均值和方差的计算公式。
Vibration equations of contact wires were used to derive the formulae for calculation of mean and standard deviations of stresses.
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