分化群(簇)
参考答案：
即CD，指血细胞胞膜分子上一组抗原决定簇，用它来确定细胞的分化阶段。现引伸于称呼血细胞(包括内皮细胞)膜上相应的分子。
— Would you like to go out for a walk with us?
— ___________. [ ]
A. You may ask your sister to do, too.
B. No, but I can't afford the time.
C. No, I'd like to.
D. No, I don't feel in the mood for it now
建筑基坑开挖时应进行开挖监控，对于三级基坑，可不进行监测的项目是( )。
A．结构水平位移 (B) 周
B．结构界面上
