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How much do you know about copper? Here are some basics: it’s electrically conductive, طيع, and corrosion-resistant. It’s used in several industries, including manufacturing and construction, in things such as circuit boards and roofing sheets. Copper can often be found in the form of blanks, flats, أشرطة, plates and sheet stock. احتياطيات التنغستن وفيرة في العالم… اقرأ المزيد »