Gearbox as an important source of noise and vibration, its structure-borne nois e has drawn more and more attentions and......

Research on cloud has been one of the important and difficult problems in Meteorology for a long time. Based on the Clou......

以纳米固体超强酸为催化剂合成苯乙酮酸冰片酯,在比较了不同的温度、酸醇比、反应时间对该反应酯化率的影响后,确定了在此催化剂存......

目的 建立GC法同时定量测定解热消炎胶囊中薄荷脑、异龙脑、龙脑、百秋李醇.方法 采用HP-20M毛细管柱（25 m×0.32 mm,0.3 μm）;......