Warning: file_put_contents(/www/wwwroot/ppbbu/cp667.com/cache/2b5352c9c013277c971806ac813f7d99.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/cp667.com/index.php on line 55 Coelli例句_Coelli英汉例句_Coelli双解例句_淳朴汉英词典
We adopt Battese and Coelli's (1995) model of stochastic frontier function and apply the software Frontier4.1 to evaluate the cost inefficiency score. 研究發現，研發支出與成本傚率呈正相關關系，即研發支出越多，成本傚率越高。