当用户开机按下PC机电源开关对，PC机首先执行的是（ ），然后加载（ ）。
问题1选项
A.硬盘上主引导记录
B.硬盘上分区引导记录
C.主板上的BIOS引导程序
D.软盘上的引导记录
问题2选项
A.相关支撑软件，如各种设备驱动程序
B.分区引导记录、配置系统，并执行分区引导记录
C.操作系统，如Windows XP、Windows 7、UNIX等
D.主引导记录和引导驱动器的分区表，并执行主引导记录
正确答案及解析
正确答案
解析
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