设栈S的初始状态为空,若元素a,b,c,d依次进栈,得到的出栈序列是c,d,b,a,则栈的容量至少是____。
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At posterior axillary line, the inferior margin of pleura lies at the level of
A. The 6th rib
B. The 8th rib
C. The 10th rib
D. The 11th rib
E. The 12th rib
The structure can be found in the posterior layer of superior mediastinum is
A. Brachiocephelic vein
B. Phrenic nerve
C. Vagus nerve
D. Thymus
E. Left recurrent laryngeal nerve
The structure behind the arterial ligament in ductus arteriosus triangle is
A. Trachea
B. Left phrenic nerve
C. Left pulmonary artery
D. Left recurrent laryngeal nerve
E. Thoracic aorta
The structure travels anterior to root of lung is
A. Vagus nerve
B. Azygos vein
C. Phrenic nerve
D. Thoracic aorta
E. Trachea