超声波测距外文文献加中文翻译-,:,,forinstance,,inwhichthemeasurementsaremade,,-,andatfirstglanceappearsverysimple,-dimensionalcontactwiththetestobjectduringseverechangesintheair'(ultrasonic),,.,,however,,munication,withthepassbandofthereceivingandradiatingelementsintheapparatus,municationchannel,
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