【名词&注释】
物理量(physical quantity)、过敏反应(allergic reaction)、动脉瘤(aneurysm)、银离子(silver ion)、肺动脉干(pulmonary trunk)、右下肺动脉(right inferior pulmonary artery)
[单选题]右肺门角是哪两种结构的夹角 ( )
A. 右中叶静脉和右下肺动脉(right inferior pulmonary artery)
B. 右下肺动脉(right inferior pulmonary artery)干(pulmonary trunk)和右主支气管
C. 右上叶下后静脉干和右下肺动脉(right inferior pulmonary artery)
D. 右上叶下后静脉干和气管
E. 右上叶下后静脉和右主支气管