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...
They walked past stalls selling huge sprays of crimson, saffron and cobalt flowers.他们经过很多卖花的摊位，摊位上摆着大把大把的鲜花，有深红色的，有金黄色的，还有深蓝色的。Will you please tell me the secret of your saffron sauce?你能告诉我你的香料调味秘方 吗 ?Vegetable shortenin...
Highstand System Tract mainly develops depositional system of offshore - meare, fluvial facies and prograded delta.高位体系域主要发育滨浅湖相 、 河流相及进积型三角洲沉积体系.The relation between depositional environments and reservoir quality is in...