短語詞組短語transmission speed ratio 傳動(dòng)速比transmission power ratio 傳輸功率比transmission reduction ratio 傳動(dòng)減速比transmission velocity ratio 傳速比transmission gear ratio 傳動(dòng)齒輪速比;變速齒輪比;傳動(dòng)齒輪齒數(shù)比transmission reflection ratio spectrum 透射transmission thickness ratio 透照厚度比transmission intensity ratio method 透射強(qiáng)度比法transmission utilization ratio 傳輸利用率 返回 transmission ratio