以改性Y分子筛为催化剂,γ-丁内酯和乙醇胺为原料,采用γ - 丁内酯法两步合成N - 羟乙基吡咯烷酮 ( NHP ). N - hydroxyethylpyrrolidone ( NHP ) was synthesized from � � - butyrolactone and ethanolamine on Y molecular sieve catalyst by two steps.
...violent disturbances which have left at least ten people dead...造成至少10人死亡的暴乱This entity includes lesions and functional disturbances of para articular tissues: tendons, ligaments, synovial bursae.这个名称包括了关节周围组织(肌腱, 韧带,...
他的叙述是方言和土语最成功的运用.His narrative is a super rendering of dialect speech and idiom.她说起土语来像个当地人.She slings the bat like a native.其科学名称来自当地土语Afar中的 “ 根”这个词.The creatures take their scientific name from the word for'root&...
Australia, put in to bat, made a cautious start.轮到澳大利亚队出场击球，他们开始打得很谨慎。Investors are playing it cautious, and they're playing it smart.投资者审慎精明地行事。Employers may become overly cautious about taking on new staff.雇主在雇用新职...