测定清除率的意义何在?
参考答案:
测定清除率不仅可以了解肾的功能,还可以测定肾小球滤过率、肾血流量和推测肾小管转运功能。
I've been collecting snow globes ________ I was eight years old. [ ]
A. for
B. since
C. in
D. at
下列哪项实验不能证明光的波动性?()
A、干涉
B、衍射
C、共振
D、光电效应