选择素分子识别的配体是()A．CD15s(sLex) B．CD21 C．CD31 D_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

选择素分子识别的配体是()

A．CD15s(sLex)

B．CD21

C．CD31

D．CD44

E．钙粘蛋白

答案

参考答案：A

单项选择题

鞭虫卵的典型特点是( )

A．呈纺锤形
B．黄褐色
C．卵壳较厚
D．两端各有一个透明的盖塞

单项选择题

Passage Three
Questions 32 to 35 are based on the passage you have just heard.

A．The influence of old people in the U.S.

B．Citizens and life in the U. S.

C．Changes in American families.

D．The old people in the U. S.