Smooth leather with silver chain edging one side, and heavy grain leather on the reverse.
一面是光滑的皮质，装饰有银链边饰，反面是粗糙的谷粒一样的皮质。
The present invention relates to a recovery method of fine grain gold from heavy concentrate.
一种从重砂中回收细粒金的方法。
The present invention relates to a recovery method of fine grain gold from heavy concentrate.
一种从重砂中回收细粒金的方法。
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