Warning: file_put_contents(): Only 0 of 7511 bytes written, possibly out of free disk space in /www/wwwroot/ndsq.cn/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_开心英文字典_柠咚词
Aiming at the application of the telescope, the main performance of the fiber are the spectral-transmission efficiency and the focal-ratio degradation. 针对此望远镜的应用，对光纤的要求主要集中在对星光的传输性能和焦比蜕化性能上。