【荐读】一起苗苗苗，这些要记牢
http://file.tax100.com/o/202105/27/411_1622062552123.gif?width=1079&size=154842截至2021年5月23日
我国新冠疫苗接种超5亿剂次
近日，单针新冠疫苗在我国多地开打
一针、两针、三针疫苗有啥区别？
新冠疫苗的保护期只有半年吗？
更多问题，一起了解
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来源：央视新闻
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