Warning: file_put_contents(): Only 0 of 5976 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/201990.com/index.php on line 55 Coelli例句_Coelli英汉例句_Coelli双解例句_耀久九英英词典
We adopt Battese and Coelli's (1995) model of stochastic frontier function and apply the software Frontier4.1 to evaluate the cost inefficiency score. 研究发现，研发支出与成本效率呈正相关关系，即研发支出越多，成本效率越高。