Source: Computational Materials Science, Volume 267
第十七条 纳税人以人民币以外的货币结算销售额的，在折合成人民币计算时，折合率可以选择销售额发生的当日或者当月1日有效的人民币汇率中间价。纳税人确定折合率后，12个月内不得变更。
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Accessing the Widevine Repository — Google for Developers
In addition to being cleaner for the environment, he said it could be "cheaper to get rid of that waste through an anaerobic digestion plant" than other methods.