【多选题】【消耗次数：1】
骨质疏松的表现有
①
骨结构改变
②
骨量减少
③
骨的韧性增加
④
易骨折
参考答案：
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下列颌骨骨髓炎中易形成大块死骨的是
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化脓性中央性颌骨骨髓炎急性期
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化脓性中央性颌骨骨髓炎慢性期
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化脓性边缘性颌骨骨髓炎慢性期
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