400-600-1123
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答案：
C
解：因为
条件一说：S的中位数是0，只能得出a=-2,不能判断T中B的值；
条件二说：S的数值值和等于T得数值值和，只能列出5a+10=7b+21，不能判断中数是否相等；但是将两个条件联立，发现可以求出B的值，这样就可以判断两个集合的中位数是否相
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