As large amounts of dollars flow into China through net exports and foreign investment the Chinese central bank must buy up these dollars at the pegged exchange rate.

由于大量美元通过净出口和外国投资的形式流入中国，中国央行必须按盯住的汇率买进这些美元。

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The paper introduces a framework of the signal exchange device, the circuit of CAN bus, the net of CAN bus, and the flow of CAN bus program.

本文介绍了信号转换装置的结构、CAN总线电路、组网，及CAN总线工作的程序流程。

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