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Anonymous users2024-01-24It should be an internal grading standard. Above the pass line, it is divided into 3A, 2A and so on. Different manufacturers have different grading methods. Generally speaking, 2a is the best.
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Anonymous users2024-01-23The standard within the enterprise has no practical significance; Now the state only allows ceramic products to be qualified, and is not allowed to be marked with excellent products and several A products
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Anonymous users2024-01-22There is no such provision in the national and industry regulations, and this is used to fool people.
It's good for you. You can choose to consider the threshold that is acceptable to the general public. It is possible to communicate.
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