Real-mode programs freely execute CLI and STI to control interrupts, PUSHF and POPF to manipulate flags, INT n for DOS and BIOS calls, and IN/OUT for hardware I/O. In normal protected mode, these instructions are privilege-checked -- they execute normally if the caller has sufficient privilege, and fault otherwise. The 386 can't simply let V86 tasks execute them freely -- a DOS program disabling interrupts would bring down the whole system -- but trapping on every INT 21h call would make V86 impractically slow.
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（一）行政执法的主体、人员是否具有合法资格；，详情可参考同城约会
Up to 25W (wired), 15W (wireless)
// 易错点2：遍历结束后k仍0 → 栈是递增的，末尾数字更大，移除末尾k位