DOS 2.0 was developed to support the IBM PC/XT (introduced in March 1983), which came with 128K RAM standard, and models with 256K appeared soon enough. Even the older PCs could be upgraded with additional RAM, and DOS needed to have some mechanism to deal with that extra memory.
如果你更在意系统流畅度和综合性能，可以选择 Lumia 930。这是整个平台成熟期的代表作，配置扎实、屏幕出色、工业设计扎实，而且还能升级到 Windows 10 Mobile。
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Most significant is fiscal drag, where the thresholds that apply to different rates of tax on income are frozen.
30多年前，在福建最贫困的闽东山区任职，习近平同志就明确强调：
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