class StockSpanner {
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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.，这一点在im钱包官方下载中也有详细论述
（三）明确网络犯罪防治义务。按照网络服务提供者的业务规模、技术能力等设置相应的网络犯罪防治义务，督促其建立健全防范、发现网络犯罪的制度、措施，充分发挥网络服务提供者预防网络犯罪“第一道防线”的作用。推进实施可信数字身份战略，建立、应用国家网络身份认证公共服务。。关于这个话题，heLLoword翻译官方下载提供了深入分析