this.stack = []; // 核心：存储索引，保证索引对应的价格单调递减
Descriptor attributes: The Type, DPL, S (system/user), and Present bits from the segment descriptor being loaded, held in a register called PROTUN. In a few cases, the Test PLA takes the 16-bit selector (segment register value) as input instead.
，这一点在im钱包官方下载中也有详细论述
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Police fired tear gas to disperse crowds allegedly trying to take the scattered banknotes.
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