A.
B.
C.
D.
[单选题]A.结核性胸膜炎B.肾病综合征C.癌性胸水D.化脓性胸膜炎E.全心衰
[单选题]A.痈B.疔疮C.暑疖D.疖病E.有头疽
[单选题]A.点(0,0)不是f(x,y)的极值点B.点(0,0)是f(x,y)的极大值点C.点(0,0)是f(x,y)的极小值点D.根据所给条件无法判断点(0
[单选题]A.B.C.D.