• 2021-04-14
    中国大学MOOC: 每一吨铸件的成本 http://edu-image.nosdn.127.net/_PhotoUploadUtils_8f2ca594-94d2-4088-bcf3-90a61f0a71c1.png (元)与工人劳动生产率 http://edu-image.nosdn.127.net/_PhotoUploadUtils_41792d06-d058-466f-a49f-e4f2911c4101.png (吨/人)之间的回归方程为 http://edu-image.nosdn.127.net/_PhotoUploadUtils_70994eb1-d8c5-4a4e-be55-d62770139216.png,这意味着劳动生产率每提高一个单位,成本就( )