没有锰、钴、铬、铂,就没有汽车、飞机、喷气发动机、人造卫星,也没有尖端武器,甚至没有家庭用具. 美国的这些战略物资的消耗量大部分依赖进口:锰-98%,钴-97%,钼土矿-91%,铬-91%,石棉-85%,镍-70%,锌-57%均靠进口.这些物资,有些是靠一些高度不稳定的地区如中、南非供应的.一旦供应被切断,现有储备只够维持正常生产几个月.因此,美国地质研究 Without manganese, cobalt, chromium, platinum, there would be no cars, airplanes, jet engines, satellites, or sophisticated weapons, or even household appliances. The consumption of these strategic materials in the United States depends largely on imports: manganese -98%, cobalt -97%, molybdenum ore -91%, chromium -91%, asbestos -85, nickel -70%, zinc -57% are all imported. These materials, some rely on some highly unstable areas such as China, South Africa Supply. Once supply is cut off, existing reserves are only enough to maintain normal production for several months. Therefore, US Geological Research