// 易错点2：用Math.ceil/Math.floor取整 → 破坏时间比较逻辑，必须精确计算
第二十八条 增值税法第二十四条第一款第三项所称古旧图书，是指向社会收购的古书和旧书。
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第四十条 行政执法监督人员在行政执法监督中滥用职权、玩忽职守、徇私舞弊的，依法给予处分；构成犯罪的，依法追究刑事责任。
NAPA, Calif. -- In the immortal words of song developer Pete Townshend, "Well, who are you? (Who are you? Who, who, who, who?) I really wanna know!" Linux kernel maintainers have the same question: Who are their programmers, and how can the kernel community be sure the code they submit is really theirs?