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当前学科:口腔预防
题目:
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预防口腔癌的政策之一是烟盒前后面印有“吸烟有害健康”的忠告,其面积应为烟盒的()
A . 3%~5%
B . 7%~9%
C . 10%~20%
D . 20%~30%
E . 30%~50%
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