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This operating system was called Disk operating system or DOS.
这个操作系统后来就被叫做磁盘操作系统。
youdao
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This lesson will teach the disk operating system-DOS.
本期为第二讲，讲授磁盘操作系统——DOS。
youdao
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This lesson will teach the disk operating system-DOS.
本期为第二讲，讲授磁盘操作系统——DOS。
youdao