23.肺部正常之手術後病人，拔除氣管內管後出現stridor時，肺功能檢查之流量容積曲線，可能出現下列何項異常？ (A)FEF 200-1200（forced expiratory flow between 200～1200 mL VC）升高 (B)FEF 25-75（forced expiratory flow between 25%～75% VC）升高 (C)FEF 75-85（forced expiratory flow between 75%～85% VC）升高 (D)FEF 50 / FIF 50 比值升高