400-600-1123
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答案：
B
答案：Bp>
(1) 任意两个数相乘 积为0 如果只有3个数的话 0，-1，0 也符合题意 但并不是每一个数都为0 不充分
(2) 任意两个数相加为0 a+b=0 b+c=0 a+c=0 可以得出a+b+c=0 a=0=b=c 多个数同理 所以充分
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