下列软膏剂基质中,吸水性最强的是()
A.羊毛脂
B.凡士林
C.聚乙二醇
D.液体石蜡
E.甘油酯
参考答案:A
解析:在油脂性基质中羊毛脂吸水性强,可吸收约2倍的水形成W/O乳剂基质。
Fred ________ many football boots. But this pair of boots ________ the nicest. [ ]
A. has, are
B. has, is
C. there are, are
D. there are, is
挥发份低的煤种,着火温度(),着火热量(),完全燃烧时间(),应适当()炉膛温度来加强燃烧。