【单选题】【消耗次数：1】
慢性化脓性骨髓炎，如大部分病灶已愈合，只有小块死骨存在，死腔不大的，应采取的治疗方法是（ ）
①
单纯窦道刮除术
②
单纯死骨摘除术
③
切开引流术
④
大量抗生素应用
⑤
死骨摘除窦道刮除碟形手术
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