纳税人适用免征增值税的出口业务，可以放弃免征增值税，选择缴纳增值税，自放弃免征增值税之日次月起，适用免征增值税的出口业务按规定缴纳增值税。
Nations including the US, China, Russia, India and Japan are rushing to explore the Moon's surface, with some planning permanent human settlements.
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stack.pop(); // 弹出无效候选值
for (int i = 0; i < n; i++) {