慢性肾炎综合征的特点有（）
A.蛋白尿
B.血尿
C.高血压
D.水肿
E.高血脂
参考答案：A, B, C, D
The new policy will________the elders a lot that people over 65 can take buses free of charge. [ ]
A. discount
B. support
C. approve
D. benefit
交换机有哪3种工作方式，各有什么特点？
