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johney(½ð±Ò+1): 2010-09-17 13:19:22
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johney

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zhangyu506

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johney(½ð±Ò+1): 2010-09-17 19:02:47
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johney(½ð±Ò+1): 2010-09-17 19:02:50
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johney(½ð±Ò+1): 2010-09-17 19:03:13
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ASTM E18-03 Test methodsfor Rockwell hardness and Rockwell Superficial hardness of Metallicmaterials
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liumingchang

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johney(½ð±Ò+1): 2010-09-20 20:25:03
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johney(½ð±Ò+1): 2010-09-20 20:24:52
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