.
We made our monitor _______ of our football team.
A.a head
B.head
C.the head
D.heads
答案:B
在生物素标记抗体时,生物素:IgG的比例(mg/mg)为多少时,效果较好()
A.1:1
B.2:1
C.3:1
D.4:1
E.5:1
举例说明修剪方法中五个“伤”的内容?