A:A public figure as is he
B:Public figure as he i
C:Public figure he is a
D:A public figure as he i
在医疗实践中,器官移植是拯救某些患者的重要方法。但是无血缘关系的供体器官移植后往往很难成活,具有血缘关系的供体器官移植后成活的概率较大。从分子生物学水平看,其原因是( )
一遥控玩具小车在平直公路上运动的位移一时间图象如图所示,则( )