The Doppler frequency can be obtained as a heterodyne or beat effect.由于外差或频差效应,能够得到多普勒频率.That's a heterodyne receiver.那是外差式接收机.Function test and calibration self - heterodyne curve for direction finder on sea trial....
The detachments made use of diversionary tactics to stand the enemy off.分遣队使用牵制战术,阻止敌军前进.They asked the British to launch a diversionary attack on the north coast.他们要求英国在北部海岸发动佯攻。Buyers and sellers is mutual on credit gr...