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YouTube > MaterialsScience2000
Rockwell Hardness Test
YouTube · MaterialsScience2000 · 58.6万次播放 · 2013年1月26日
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YouTube > Practical Guru
ROCKWELL HARDNESS TEST || HOW TO PERFORM ROCKWELL HARDNESS TEST || ROCKWELL HARDNESS MACHINE
YouTube · Practical Guru · 9.5万次播放 · 2018年10月16日

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