Demand analysis (strictness)
半导体设备ETF易方达紧密跟踪中证半导体材料设备主题指数，中证半导体材料设备主题指数选取40只业务涉及半导体材料和半导体设备等领域的上市公司证券作为指数样本，反映半导体材料和设备上市公司证券的整体表现。
* 核心功能：每次调用next(val)，返回当前价格的跨度（往回数≤当前价格的最大连续天数）。体育直播对此有专业解读
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A single vintage postage stamp displayed on a flat matte black background (#0a0a0a), centered in a 16:9 canvas with small black borders visible on all sides. The stamp itself is an ultrawide horizontal rectangle at approximately 3:1 aspect ratio. The stamp has serrated/perforated zigzag edges on all four sides, like a real postage stamp, with clean white perforation teeth.