【多选题】【消耗次数：1】
通信双发的信息交换方式主要有（ ）
①
单工通信
②
数字通信
③
全双工通信
④
半双工通信
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相关题目
【单选题】
关于半双工通信方式，下列说法正确的是。
①
某一时刻通信双方能同时双向传送数据
②
通信双方只能单向传送数据
③
通信双方不能同时收发数据，但可以在不同时候在两个方向传送
④
上述说法均正确
【单选题】
关于全双工通信方式，下列说法正确的是.
①
通信双方能同时双向传送数据
②
通信双方只能单向传送数据
③
通信双方不能同时收发数据，但可以在不同时候在两个方向传送
④
上述说法均正确
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The sports meeting was put off till the next week ______ rain.
①
in spite of
②
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It was not until he arrived in class _____ realized he had forgotten his book.
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when he
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判断线上的内容是否正确：The teachers tried to __convince____ these students that they could solve the complicated problem, however, they just didn’t see the point.
①
正确
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判断线上的内容是否正确：For ten years the Greeks ___surrounded___ the city of Troy to separate it from the outside.
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After the Minister of Education had finished speaking at the press conference, he was made ______ all sorts of awkward questions.
①
answer
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①
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I _____ the right to appeal to higher authorities.
①
conserve
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