Warning: file_put_contents(/www/wwwroot/zidian/diubi.cn/cache/50fa7ad4c3e4860b2a6f9838abb5e7be.txt): failed to open stream: No space left on device in /www/wwwroot/zidian/diubi.cn/index.php on line 59 focal-ratio degradation是什么意思，focal-ratio degradation的翻译，focal-ratio degradation音标、读音、用法和例句_果味酸柯林斯词典
Aiming at the application of the telescope, the main performance of the fiber are the spectral-transmission efficiency and the focal-ratio degradation. 針對此望遠鏡的應用，對光纖的要求主要集中在對星光的傳輸性能和焦比蛻化性能上。