Beam quality factor M~2 is measured by the means of knife edge for different bending of LMA fiber and the slope efficiency is measured separately.是什么意思_Beam quality factor M~2 is measured by the means of knife edge for different bending of LMA fiber and the slope efficiency is measured separately.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句