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.
Especially, the number of Bohr magneton calculated is in good agreement with those experimentally determined.特别是, 计算所得到的Bohr磁子数与实验值颇为吻合.When the photon acts as the medium of magnetic field, it is called photonic magneton...
水有源, 木有本.A stream has its source, a tree has its root.木有本,水有源.Every tree has its roots and every river has its source.爱金钱是万恶之源.The love of money is the root of all evils....