近日，中国食品科技学会等单位发布“2024年食品安全与健康流言榜”，对几个有关食品安全的流言进行辟谣。馒头冷冻3天就不能吃了、常温牛奶保质期长是因为添加了防腐剂、反季节果蔬添加了过量农药？这些都是真的吗？
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