【名词&注释】
食管癌(esophageal carcinoma)、整体性(integrity)、统一性(unity)、局限性(limitation)、综合性(comprehensive)、灵活性(flexibility)、肺循环(pulmonary circulation)、群体性(group character)、体循环压(pressure of systemic circulation)
[单选题]正常情况下肺循环(pulmonary circulation)压是体循环压(pressure of systemic circulation)的
A. 1倍
B. 1/2
C. 1/4
D. 1/5
E. 1/6