• A through hole is arranged on the surface of the hood. The width of the through hole is larger than the maximum width of a blackboard brush.

    防护罩表面开口,且宽度大于粉笔最大宽度。

    youdao

  • A through hole is arranged on the surface of the hood. The width of the through hole is larger than the maximum width of a blackboard brush.

    防护罩表面开口,且宽度大于粉笔最大宽度。

    youdao

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