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问题 单项选择题

一个亲和素分子可以结合几个生物素分子（）。

A.4个

B.5个

C.8个

D.12个

E.2个

答案

参考答案：A

解析：亲和素由4个亚基组成，可以结合4个生物素。

阅读理解

读一读，填一填。

Jack: When is your birthday, Mary?

Mary: It's in February.

Jack: I know. But what's the date?

Mary: It's February 19th.

Jack: And when is your dad's birthday?

Mary: It's September 21st.

Jack: That's today! Mary.

Mary: Oh, no!

1. Mary's birthday: __________________________________ 

2. Her dad's birthday: ________________________________

3. Date for today: ___________________________________
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多项选择题

关于胎膜早破，下列正确的是（）

A. * * 液涂片用苏丹染色见橘黄色脂肪小粒可确定为羊水

B. * * 液pH≥6.5时可考虑胎膜早破

C.孕期达35周以上胎膜早破者，可令其自然分娩

D.若羊水池深度≤5个单位可采用羊水输注法注入羊水

E.足月破膜＞24小时未临产者予催产素引产
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