《中国药典》中,厚朴质量控制成分的结构类型是()
A.黄酮
B.香豆素
C.蒽醌
D.二萜
E.木质素
参考答案:E
When we came to the gate, he stopped ___________ me go in first. [ ]
A. to let
B. to tell
C. to allow
D. to ask
变色硅胶吸水后变为粉红色,应在()℃下烘干再用。
A.93
B.105
C.150
D.120