ARQ mode is used in the data transmission system for increasing data receiving rate.

数据传输采用单频时分制、ARQ传输方式，大大提高了短波通讯数据传输的接收效率。

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In task mode, you complete the tasks in accordance with the order of increasing difficulty.

按照难度递增的顺序完成各个任务。

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In task mode, you complete the tasks in accordance with the order of increasing difficulty.

按照难度递增的顺序完成各个任务。

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