* @param arr 数组
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The online world is full of content restrictions and blockades. It might not always seem like that, but look around. More and more restrictions on your movement are coming into force.，这一点在旺商聊官方下载中也有详细论述
（四）购进农产品时，除取得增值税专用发票或者海关进口增值税专用缴款书外，按照农产品收购发票或者农产品销售发票计算的进项税额，国务院另有规定的除外；