The heredity for all parental characters and the utilization of the parent in heterosis breeding were analysed on the basis of the value of GCA effects and variance of SCA effects .

根据一般配合力效应和特殊配合力 方差，分析了各参试亲本的遗传特点及在杂种优势育种上的 利用价值。

In addition some performance metrics are given such as the customer loss rate the system utilization the mean and variance of the queue length the mean of the waiting time .

给出了该排队系统的顾客丢失率、系统 利用 率、队列长度的均值/ 方差、平均等待时间等性能指标的计算公式。