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Цены на нефть взлетели до максимума за полгода17:55
，这一点在safew官方下载中也有详细论述
Web streams use a locking model to prevent multiple consumers from interleaving reads. When you call getReader(), the stream becomes locked. While locked, nothing else can read from the stream directly, pipe it, or even cancel it — only the code that is actually holding the reader can.
输入：num = "1432219", k = 3