下列河岸中，冲刷严重的是（箭头表示水流方向）
A．①②
B．②④
C．②③
D．①④
答案：C
All of the following cells arise from cells arise from undifferentiated mesenchymal cells within connective tissue and remain there permanently EXCEPT？
A．pericytes
B．eosinophils
C．fibrolasts
D．osteoblasts
E．adipocytes
药代动力学的几个重要参数表示符号
生物半衰期为
A．KB．KaC．FD．VE．t1/2
