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  • <font color='#006600'>River pebble case</font> River pebble case

    2019-05-05

    日期:

    作者:phoenix   来源:www.pmpsj.com

    China's river pebble resources are numerous, its main chemical composition is silica, followed by a small amount of iron oxide and trace amounts of manganese, copper, aluminum, magnesium and other elements and compounds, hard quality, with n...

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