my country is the main producer of copper and gold powder. Copper and gold powder is mainly used in the printing and coating industries.

my country is the main producer of copper and gold powder. Copper and gold powder is mainly used in the printing and coating industries

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my country is the main producer of copper and gold powder. Copper and gold powder is mainly used in the printing and coating industries.

2023年11月17日 5Like 36read Comments

Copper-gold powder, referred to as gold powder, is a me…