... copper phosphate 磷酸铜 21世纪教育网 copper piece 铜片 copper plate printing press 凹版印刷机 ...
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thin copper piece 薄铜片
Process Flow Copper Piece 工艺流程铜件
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Putting tin directly onto the copper piece would reduce the manufacturing steps and costs, Norton said.
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This is a piece of copper foil 20cm square that has 696 rings, a portion of which is reproduced above.
ECONOMIST: The search for alien life
Everything from the ancient brass light switches and the copper bathtubs to the 12-foot alligator floor piece was hoarded by the peripatetic Mr. Yeh.
FORBES: Lifestyle Feature
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