There are many rules in object-oriented systems, which describe the characters of business flow control, data-processing criterion, information filtering strategy and so on.
规则大量存在于面向对象系统中，反映了诸如业务流程控制、数据处理准则、信息过滤策略等特点。
According the error processing criterion, if the measurement error is 3 times larger than the standard error, the singular data can be deleted and substituted with arithmetic average value.
依据拉依达准则，剔除测量误差大于3倍标准差的奇异数据并以算术平均值代替，简便易行。
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