Check cover surface:<br>Tilt the machine to 45 degrees, (1) check the logo: no scratch, high warping, wall climbing, oxidation, falling off; (2) check the cover surface: no discoloration, no knock, no bulging, no perforation, no deformation, no mistake and no imprint. The relevant defects such as scratches, scurf and particles shall be judged according to the appearance standard.<br>
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