聚丙烯酰胺凝胶电泳中应用的交联剂是
A.丙烯酰胺
B.甲叉双丙烯酰胺
C.琼脂糖
D.淀粉
E.硅胶
参考答案:B
In spite of his disappointment, he _______ a weak smile.
A.confirmed
B.persuaded
C.cancelled
D.managed
结构施工图中"结构总说明"的图号是()。
A.J-0
B.J-1
C.G-0
D.G-1