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单选题
The concept of television, ______ images over distances, had intrigued scientists even before the invention of moving pictures or radio.
A
the transmission of
B
transmitted by
C
transmission into
D
the transmitting for
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参考解析
解析：
因为电视能远距离传输图像，所以在电影和无线电出现之前就有科学家对它产生浓厚的兴趣了。“the transmission of images” 是 “the concept of television”的同位语。
因为电视能远距离传输图像，所以在电影和无线电出现之前就有科学家对它产生浓厚的兴趣了。“the transmission of images” 是 “the concept of television”的同位语。
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enabling Real-Time Transport Protocol （RTP） header compressionC
enabling distributed compressed Transmission Control ProtocolD
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enabling TCP header compression
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use English languageB
always use the International CodeC
preface it by the word SOSD
follow the transmission with the radio alarm signal
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It fragments larger packets and allows VoIP packets to be transmitted in between them.C
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单选题What should you do if you have transmitted a distress call a number of times on channel 16 and have received no reply?（）A
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单选题Before（）,a station shall take precautions to ensure that its emission will not interfere with transmission already in progress.A
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