胰岛素原比胰岛素()
A.多一段14肽
B.少一段14肽
C.多一段C肽
D.少一段C肽
E.多两个二硫键
参考答案:C
In spite of his disappointment, he _______ a weak smile.
A.confirmed
B.persuaded
C.cancelled
D.managed
简述证券发行的注册制和核准制的区别