This paper apply the gray System theories, regard unit cost of historyical similar item construction as the basis, establish the non-isometric time sequence GM(1,1) model of item construction unit cost.是什么意思_This paper apply the gray System theories, regard unit cost of historyical similar item construction as the basis, establish the non-isometric time sequence GM(1,1) model of item construction unit cost.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句