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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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