【名词&注释】
肺动脉(pulmonary artery)、支气管(bronchial)、淋巴结(lymph node)、梯度回波脉冲序列(gradient echo pulse sequence)
[填空题]通常较容易显示的纵隔淋巴结为_____________、_______________、__________________、__________________、______________及________________。