Confirmation method: Observe the sealing part with naked eyes or a magnifying glass, and check whether the sealing part is qualified. <br>Acceptable standards: The product packaging should be free of defects such as obvious dirt, dirty spots, discoloration and leaks; the heat-sealed part should be smooth and there should be no obvious wrinkles, and the indentation inside and outside the heat-sealed part should be uniform, and there should be no obvious melting phenomenon.
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