1、System study for quality ordering of fly ash
粉煤灰質(zhì)量有序化系統(tǒng)

2、The information system study and application is a noteworthiness subject.
對信息系統(tǒng)技術(shù)的研究與應(yīng)用也成為人們關(guān)注的課題。

3、PDM System Study Based on Web
基于Web的PDM系統(tǒng)研究

system study翻譯