()is a category assigned to products or services having the same functional use but differ
（）is a category assigned to products or services having the same functional use but different technical characteristics．It is not same as quality．（）A．Problem B．Grade C．Risk D．Defect
等级是对具有相同使用功能，但技术特性不同的产品或服务所赋予的类别。它与质量不同。
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