[名词解释] 差异性紫绀(DifferentialCyanosis)

诊断纵隔恶性畸胎瘤的指征是() ["A．位于前纵隔","B．肿瘤直径超过5cm","C．含脂肪信号","D．局部受侵，肿瘤边缘不规则","E．以上均是"] 简述钾的生理功能。 TetralogyofFallot，TOF 牵涉痛 patentductusarteriosus 差异性紫绀(DifferentialCyanosis)