N - hydroxyethylpyrrolidone ( NHP ) was synthesized from � � - butyrolactone and ethanolamine on Y molecular sieve catalyst by two steps. 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 ).
Complementary to the three additive light primaries, there are three subtractive primaries.与加色法三原色互为补色的颜色为减色法三原色.The mixing of additive primaries to match a specific colour.混和加色法原色,使它与某一指定颜色相似.State by state, results fro...
But Miss Ellen she went down dar an'she nuss Emmie.可是爱伦小姐还是去了,她在那里照料埃米." I feared Emmie would die too, but I think she will live. "" 我本来担心埃米也会死, 不过现在我想她会活下去的.Emmie's baby has been born and is dying and must be ...
trenchant criticisms一针见血的批评He was shattered and bewildered by this trenchant criticism.他因这番尖锐的批评而万念俱灰，茫然不知所措。His speech was a powerful and trenchant attack against〔on〕 apartheid.他的演说是对种族隔离政策强有力的尖锐的抨击。He formulated trench...