Studies of sulfonated phenol-formaldehyde resins: preparation of HJ-superplasticizers and their effects on workability and mechanical strength of concretes是什么意思_Studies of sulfonated phenol-formaldehyde resins: preparation of HJ-superplasticizers and their effects on workability and mechanical strength of concretes在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句