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Ⅱ类电器产品的“回”字问题

Ⅱ类电器产品上的“回”字中除了外”口“的边长是内”口“边长两倍以外，对”口“线条粗细有无要求，如果有要求可以从哪个标准中查到？
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Class II 回字符号的尺寸

标准所在IEC 60417-5172, GB/T5465-5172

The dimensions of above symbol shall be such that the length of the sides of the outer square is about twice the length of the sides of the inner square.
It can be enlarged and reduced proportionate and it is legible to the naked eye.

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