JIO_OK ("jump if I/O OK") tests whether CPL ≤ IOPL. The same check gates PUSHF, POPF, INT n, and IRET. The monitor then emulates each instruction as appropriate: maintaining a virtual interrupt flag per V86 task, reflecting software interrupts through the real-mode interrupt vector table, virtualizing I/O accesses, and so on.
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同样重要的还有空间。零跑很清楚：在这个价位，车子可以小，但内部空间可不能小。。WPS官方版本下载对此有专业解读
swap(&arr[i], &arr[j]);