【名词&注释】
急性心肌梗死(acute myocardial infarction)、心脏病(heart disease)、太极拳(shadowboxing)、肺动脉栓塞(pulmonary embolism)、田径比赛(track and field competition)、人工呼吸(artificial respiration)、肺血管炎(pulmonary vasculitis)
[单选题]心肺复苏时,心脏按压与人工呼吸(artificial respiration)之比应为
A. 4:1
B. 5:1
C. 10:2
D. 15:2
E. 30:2