问答详情-how about the difference between grade YG6 and YG6x
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how about the difference between grade YG6 and YG6x

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 difference between grade YG6 and YG6X
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  • 0865598567

    0865598567 2017-09-05 13:45:26

    the grain size and the hardness is difference

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  • 0865598567

    0865598567 2017-09-05 13:45:25

    the grain size and the hardness is difference

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