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封装常用的正则表达式函数：失去焦点验证，全部验证通过才能提交。附件上交作业。-邮箱验证-手机-url-日期-中文-密码-身份证

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均方值Ψx2与均值μx、方差σx2的关系是Ψx2=μx2-σx2。 ( )

A. 对
B. 错

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