描述计数资料的相对数主要包括：（）。

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【单选题】【消耗次数：1】

描述计数资料的相对数主要包括：（）。

① 构成比、率、相对比

② 百分率、千分率、万分率

③ 百分比、千分比、万分比

④ 发病率、患病率、感染率

⑤ 出生率、死亡率、增加率

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