短語詞組短語cable beam stiffness ratio 索梁剛度比beam propagation ratio 光束傳播因子beam sharpening ratio 波束銳化比beam splitting ratio 分光比beam expanded ratio 擴(kuò)束比beam length ratio 寬長(zhǎng)比beam intensity ratio 光強(qiáng)比beam expanding ratio 擴(kuò)束比beam draft ratio [船]寬度喫水比;型寬 返回 beam ratio