cross covariance造句

"cross covariance"是什么意思   


  1. By making use of the time dependent covariance and cross covariance formula which used to calculate the non - stationary response under earthquake random excitation and deduced by xiyuan zhou and hu in 1965 , the covariance and cross covariance formula of the four envelope models was deducted and the result of four models compared
  2. It's difficult to find cross covariance in a sentence. 用cross covariance造句挺难的


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