标本存放于冰箱一天后测定可造成( )
A．血Na+升高B．血Cl-升高C．血K+升高D．血Cl-升高E．血K+不变
参考答案：C
临床实验室常用质控血清，一般采用下列哪一种材料（）。
A.马血清
B.牛血清
C.羊全血
D.狗全血
They _______lessons this afternoon . [ ]
A. have any
B. not have any
C. don't have any
D. don't have some
