营养素包括哪几类物质，其来源如何?
atrialseptaldefect
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"]
差异性紫绀(DifferentialCyanosis)
关于一侧肺不发育的X线表现，下列哪项是不正确的() ["A．患侧胸部密度均匀增高","B．无血管纹理分布","C．心脏纵隔移向患侧","D．两侧胸廓大小形态对称","E．患侧动脉主干发育不良或缺如"]
TetralogyofFallot，TOF
