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答案：
D
Max(x,y)等于x
,y两个数中较大的一个，Min(x,y))等于x,y两个数中较小的一个。 求min(10, w)，即求10和w两数中较大的一个，需要确定w和10的大小关系，若w>10，min(10, w)=w，若w<10，则min(10, w)=10；确定任意中情况都是sufficient的。
单独条件1，w=max(20,z)，w等于20和z中较大的一个，若z>20, w=z>20>10，min(10, w)=w；
单独条件2，w=max(10, w)，则w>10，则min(10, w)=w； 任意条件单独都可以确定min(10,w)=w
选D。 
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