词汇	D/U
释义	D/U =期望信号与不期望信号之比
随便看	variable-area sound track variable area system variable-areatrack variable area track variable-area track variable area turbine variable-area turbine variable area type variable area type flow meter variable area type recording system variable area water intake variable argument variable arguments variable arguments PID variable arm variable array Variable Array Storage Technology variable assembly line variable assignment Variable assistant power steering system variable atmospheric refraction variable attenuation equalizer variable attenuator variable attribute variable audio-frequency radiosonde