【单选题】【消耗次数：1】
癌症痛三阶梯用药正确的是
①
三个阶梯分别是NSAIDs;弱阿片类；强阿片类加NSAIDs
②
三个阶梯都要用强镇痛药，只是剂量有区别
③
三个阶梯分别是NSAIDs;弱阿片类；强阿片类
④
三个阶梯分别是NSAIDs;弱阿片类加NSAIDs；强阿片类加NSAIDs
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