For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.
第三十三条 国务院财政、税务主管部门应当适时研究和评估增值税优惠政策执行效果，对不再适应国民经济和社会发展需要的优惠政策，及时报请国务院予以调整完善。
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