Aspirin is synthesized through O - acylating reaction from acid and anhydride acid with anhydrous carbonate as catalyst.以水杨酸和乙酸酐为原料,采用无水碳酸钠作为催化剂经O - 酰化反应合成了阿司匹林.One advisable way is to synthesize NFM acylating morpholine...
He was actuated entirely by malice.他完全是出于恶意。He sent the letter out of malice .他出于恶意寄出了这封信。I detected a suggestion of malice in his remarks.我觉察出他说的话略带恶意....
Hornblende bearing varieties bridge the gap over to amphibolites which are in bands and dikes.含角闪石的变种填补了带状和脉状角闪岩的中间相.Mineral constituents consist mainly of jadeite, aegirine - augite, magnesio - riebeckite, winchite , ma...