（一）包含两个以上涉及不同税率、征收率的业务；
Владислав Уткин
。关于这个话题，搜狗输入法下载提供了深入分析
The 80286 introduced "Protected Mode" in 1982. It was not popular. The mode was difficult to use, lacked paging, and offered no way to return to real mode without a hardware reset. The 80386, arriving three years later, made protection usable -- adding paging, a flat 32-bit address space, per-page User/Supervisor control, and Virtual 8086 mode so that DOS programs could run inside a protected multitasking system. These features made possible Windows 3.0, OS/2, and early Linux.
Дания захотела отказать в убежище украинцам призывного возраста09:44