That's a heterodyne receiver.那是外差式接收机.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.Function test and calibration self - heterodyne curve for direction finder on sea trial....
Darby was looking for a way to improve iron when he hit upon the idea of smelting it with coke instead of charcoal.达比一直在寻找改善铁质的方法，他猛然想到可以不用木炭熔炼，而改用焦炭。Ken Darby and the Whiskeyhill Chorus sing about life on the canal.肯恩·戴...
We debriefed our pilot after he had flown over the enemy’s land.我方飞行员飞越敌境之后，我们向他询问情况。The men have been debriefed by British and Saudi officials...英国和沙特阿拉伯的官员听取了他们的情况汇报。He went to Rio after the CIA had debriefed him.他向中央情...
'Monseigneur , he precipitated himself over the hill - side, head first, as a person plunges into the river.'“ 大人, 他头冲下跳下山坡去了, 像往河里跳一样. ”If the axis plunges, loop - shaped or zigzag patterns of ridges and valle...
These costs are deductible from profits.这些费用可从利润中扣除。Keep track of tax-deductible expenses, such as the supplies and equipment you buy.记下可减免课税的开支，比如买的原料和设备。Expenses are deductible only to the extent that in aggregate they...
Lewis Carroll was both a mathematician and an author.路易斯.卡罗尔既是数学家又是作家.The activation energy for dehydration reaction has been calculated by Freeman - Carroll method.采用Freeman-Carroll方法计算了配合物脱水过程的活化能和反应级数.Billy Hardy has ...