单项选择题
凡是在()范围内的质量差异都是偶然性因素作用的结果,属于正常范围。
A.(%26mu;-%26sigma;)~(%26mu;+%26sigma;)
B.(%26mu;-2%26sigma;)~(%26mu;+2%26sigma;)
C.(%26mu;-3%26sigma;)~(%26mu;+3%26sigma;)
D.都不是
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单项选择题
A.(%26mu;-%26sigma;)~(%26mu;+%26sigma;)
B.(%26mu;-2%26sigma;)~(%26mu;+2%26sigma;)
C.(%26mu;-3%26sigma;)~(%26mu;+3%26sigma;)
D.都不是
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