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PC—DOS的启动盘上至少应该有： ①COMMAND.COM ②IBMBIO.CO

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PC—DOS的启动盘上至少应该有： ①COMMAND.COM ②IBMBIO.COM ③IBMDOS.COM ④AUTOEXEC.BAT

①②③④

①②③

①②④

③④

参考答案:

B

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