Quality of such products shall be _____ according to the national or trade standards.

A. graded
B. confirmed
C. valued
D. fixed
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科目：高中英語 來源：湖北省模擬題 題型：單選題

Quality of such products shall be _____ according to the national or trade standards.
[     ]
A. graded
B. confirmed
C. valued
D. fixed

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