london metal exchange (lme) 数据缩写:aa - aluminium alloy 铝合金ah - aluminium high grade 高等级铝ca - copper a grade **铜na - north american special aluminium alloy 北美特型铝合金ni - primary nickel 镍pb - lead 铅sn - tin 锡zs - special high grade zinc 特型高级锌co - cobalt 钴 20210311