空气中的铅来源很广，包括熔炼厂和钢铁厂。
Lead in the air comes from myriad sources, including smelters as well as iron and steel foundries.
亚洲熔炼了76%的世界钢铁并排放了44%的污染物，但是只掌握了十分之一最有价值的品牌和风险资本活动。
Asia smelts 76% of the world's iron and emits 44% of its pollution, but hosts only a tenth of its most valuable brands and venture-capital activity.
本文介绍宝山钢铁股份有限公司特殊钢分公司最新引进的10吨氦气冷却真空自耗炉主要特点及熔炼GH738合金的冶金质量。
This article introduced the characteristics of a 10-ton VAR furnace with helium gas cooling and metallurgical quality of GH738 alloy melt with the VAR furnace.
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