Beijing colored house national standard AS-1-4 hollow cathode lamp atomic absorption element lamp beryllium nickel lead cadmium chrome copper iron-Taobao
Cu copper V vanadium Ag silver Au gold Cd cadmium Mg Li lithium K potassium Zn zinc Be beryllium Sr strontium Cr chromium Ni nickel Pb lead Tl thallium Ti titanium Mn manganese As arsenic Se Al aluminum Fe
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