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【多选题】
关于老年人呼吸系统的变化,描述正确的是A.
胸廓由扁圆形变为桶状
B.
肺功能降低,呼吸容量减少
C.
易发生呼气性呼吸困难
D.
动脉血氧分压水平随增龄而下降
E.
肺活量增加
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A.
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B.
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C.
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D.
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