尿毒症脑病的发病原因是
A．血中尿毒症毒素蓄积
B．脑循环和脑代谢障碍
C．水、电解质平衡失调
D．代谢性酸中毒
E．以上各种因素共同作用
参考答案：E
（2of3）2s规则的控制界限为
A.
B.
C.
D.
E.
-____________?
-Yes, sure.[ ]
A. Could you please help me?
B. What are you going to do?
C. How are you?
D. Why are you late?
