论文部分内容阅读
美国矿山局出版的《数据手册》预测1985—1986年大多数矿物和金属的市场,只能得到适当扩大。铜消耗量预计保持不变或比萧条水平稍有增加。铁矿石销售量预计将渐渐减少直到1990年。如果按计划开辟铅的新用途,则其
The “Data Book” published by the US Department of Mines predicts that most of the minerals and metals markets from 1985 to 1986 will only be properly expanded. Copper consumption is expected to remain unchanged or slightly above the depression level. Iron ore sales are expected to gradually decrease until 1990. If it is planned to open up new uses of lead, then