A mathematic model is built,a digraph.Using set theory to analyse the digraph model,some results are obtained in electro-ducument-process.是什么意思_A mathematic model is built,a digraph.Using set theory to analyse the digraph model,some results are obtained in electro-ducument-process.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句