Warning: file_put_contents(/www/wwwroot/ppbbbu/oiqp.com/cache/43185e18e1c664aff4d2f6ba1faa8118.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbbu/oiqp.com/index.php on line 55 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_奇葩剧汉英词典
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。