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pencils.comThe HB graphite grading scale is used to measure the hardness of a pencil's ... In reality however, there is no specific industry standard for the darkness of the ...瀏覽：869
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日期：2024-09-04
The HB graphite grading scale is used to measure the hardness of a pencil's ... In reality however, there is no specific industry standard for the darkness of the ......
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