Warning: file_put_contents(/www/wwwroot/zidian/biehu.cn/cache/cf5c51dc5c1fc62dbf7a39bc515dfc15.txt): failed to open stream: No space left on device in /www/wwwroot/zidian/biehu.cn/index.php on line 58 Ponser例句_Ponser英汉例句_Ponser双解例句_甲百汇小鸡词典
William M. Landes , Richard A. Ponser , Trademark Law : An Economic Perspective , 30 Journal of Law and Economics 265 （1987） . 边际成本是中经常提到的概念;它是指每一个单元成本;该成本代表了每生产一个额外单元的产品所增加的必要成本.