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什么是二次变频（Dual Conversion）？
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Which statements concerning casting and conversion are true？（） A、Conversion from int to long does not need a cast.B、Conversion from byte to short does not need a cast.C、Conversion from float to long does not need a cast.D、Conversion from short to char does not need a cast.E、Conversion from boolean to int using a cast is not possible.
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Which statement is true about the digital to analog conversion process？（）A、the two steps of digital to analog conversion are decompression and reconstruction of the analog signalB、the two steps of digital to analog conversion are decoding and filteringC、the two steps of digital to analog conversion are decompression and filtering of the analog signalD、the two steps of digital to analog conversion are quantization and decoding
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An administrator is ordering a new Power 550. They will mirror rootvg and are concerned about single points of failure. Which of the following features should be ordered（）A、Dual I/O planar， dual disk drives， dual SCSI adaptersB、Dual disk drive enclosures， dual disk drives， extra media bayC、Dual disk drive enclosures， dual disk drives and dual SCSI adaptersD、Dual I/O planar， extra media bay， dual disk drives
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单选题Which statement is true about the digital to analog conversion process？（）A
the two steps of digital to analog conversion are decompression and reconstruction of the analog signalB
the two steps of digital to analog conversion are decoding and filteringC
the two steps of digital to analog conversion are decompression and filtering of the analog signalD
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单选题采用二次变频高中频方案的SSB接收机，在二次变频后应接（）滤波器A
高通B
低通C
窄带D
宽带
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