【单选题】【消耗次数：1】
龋发病率计算方法是（）
①
患龋人数/受检者人数*100%
②
新发生龋人数/受检者人数*100%
③
无龋人数/受检者人数*100%
④
（患龋的暴露根面+充填的暴露根面）/（患龋暴露根面+充填的暴露根面+无龋得暴露根面）*100%
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