频率容限是发射设备的重要指标,通常用下述单位来表示:()
A、dbB
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新闻事业最终形成的标志
Awell-knownexampleofthelargescaledestructionofanecosystemthroughvegetationremovaltoaccommodatetouristfacilitiesisthecaseofthe_______.
Ifwehadbeeninformedintime,we____themforyou.
名词解释:preferredstock
Wehavetopointoutthatthepostponementofthefulfillmentofthecontract______causeduscertainexpenses.