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Data flows left to right. Each stage reads input, does its work, writes output. There's no pipe reader to acquire, no controller lock to manage. If a downstream stage is slow, upstream stages naturally slow down as well. Backpressure is implicit in the model, not a separate mechanism to learn (or ignore).，推荐阅读Safew下载获取更多信息

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第二十三条 一般纳税人购进货物（不含固定资产）、服务，用于简易计税方法计税项目、免征增值税项目和不得抵扣非应税交易而无法划分不得抵扣的进项税额的，应当按照销售额或者收入占比逐期计算当期不得抵扣的进项税额，并于次年1月的纳税申报期内进行全年汇总清算。。WPS官方版本下载对此有专业解读

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