金属 P t 为 A1 型结构,立方晶胞参 a=392.3pm, P t 的相对原子质量为 195 ,试求 P t 的密度和原子半径。
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【单选题】Cost as a Factor in Supply In a purely competitive market, the supplier of goods and services has no control over the market price, because he produces too little to influence market conditions. With ...