下列不是免疫组织化学染色失败的原因的是()
A.第一抗体为多克隆抗体
B.抗体浓度过高
C.未灭活内源性酶
D.抗原没有暴露
E.洗涤不充分
参考答案:A
--- Did you find the pen yesterday?
--- No, I didn’t find ________, but I have bought ________.
A.it; it
B.one; it
C.it; one
D.one; one
5÷8=______:______=______=______%.