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  RS-232\u548cRS-422<\/h3>\n

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  232\u8f6c422\u7535\u8def\u7ed3\u6784<\/h3>\n

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\u4f18\u52bf\u4e0e\u5e94\u7528<\/h2>\n

  \u4f18\u52bf<\/h3>\n

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  \u5e94\u7528\u9886\u57df<\/h3>\n

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\u603b\u7ed3<\/h2>\n

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