US oil firms are also said to be concerned about the ongoing security situation in Venezuela
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。服务器推荐对此有专业解读
第四十九条 纳税人适用退（免）税的出口业务，可以放弃退（免）税，选择免征增值税或者缴纳增值税，自放弃退（免）税之日次月起，适用退（免）税的出口业务免征增值税或者按规定缴纳增值税。
Nailed unit economics (CAC, margins, LTV).