尿毒症病人病情危重的表现是（）
A.BUN升高
B.高血压
C.心包炎
D.贫血
E.骨病
参考答案：C
This math problem is _________ that one. [ ]
A. so easy as
B. as difficult as
C. much difficult than
D. less easier than
有效孔隙度
