is a category assigned to products or services having the same fimctional use bu
is a category assigned to products or services having the same fimctional use but different technical characteristics. It is not same as quality.
A．Problem
B．Grade
C．Risk
D．Defect
正确答案：B解析：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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