短語(yǔ)詞組短語(yǔ)Echo Radio Frequency Simulator 回波射頻信號(hào)模擬器calculation of echo doppler frequency 回波多普勒頻率計(jì)算echo frequency content 回聲頻率容量echo frequency variation 回波頻率變化性Echo frequency Slavel 回波頻率Intermediate Frequency Echo 中頻回波high -frequency echo 高頻波紋radio frequency echo signal 射頻回聲信號(hào)video frequency echo 視頻回波 返回 echo frequency