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什么叫串行通信？

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数据帧由几部分组成？

什么叫异步通信？

Who has the(最多的) apples in your baskets?=The maths(难题) aren't easy. I need your help.=What're your(父母亲) names?This is the teachers'(办公室).They want to have lunch in the(餐馆) today.

Jim and Mike ____ football now.

A. playing
B. play
C. plays
D. are playing