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與正常人相比較，部分呼吸道狹窄的患者，其第一秒內用力呼氣體積（forced expiratory volume at the first second）與用力呼氣肺活量（forced vital capacity）之改變，下列何者正確？ (A)二者變化均不顯著 (B)前者減少，但後者變化不顯著 (C)前者變化不顯著，但後者減少 (D)二者均顯著減少

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