600.456中右边的“6”在千分位上．
故选：B．
一室模型组织和血浆中药物浓度不一定相等。( )
—_______________?
—I’m looking for a T-shirt for hot summer.[ ]
A. What can I do for you ?
B. Can you help me ?
C. What did you do ?
D. What can you do for me ?
