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In 1948, people living in remote areas could see TV programs by ______ in the Un
In 1948, people living in remote areas could see TV programs by ______ in the Un
游客
2023-09-15
20
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问题
In 1948, people living in remote areas could see TV programs by ______ in the United States. [br] In a digital cable system, if there is no key to decode the signal, then, we will only see ______.
选项
答案
an advertisement or the screen
解析
本题涉及到数字电缆系统。末段提到,数字电缆系统是加密的(encrypted),电视信号必须用正确的密码解密,如果没有密码,数模转换器就不能把信号转换成图像,这样的话,电缆系统就发送的是广告或蓝屏(advertisement or the familiar blue screen)。
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