黄芩苷的结构类型属于()
A.黄烷醇
B.香豆素
C.黄酮
D.查耳酮
E.黄酮醇
参考答案:E
纤维性很强的中药细粉制粒时,应选用的黏合剂是
A.淀粉浆
B.糖浆
C.水
D.明胶浆
E.不同浓度的乙醇
After several days of heavy rain the roof()with a loud noise, crashing (坠落) onto the ground.
A.came out
B.came down
C.came on
D.came at