A. bowl B. bottle C. can D. box
A. to B. than C. about D. around
A. 心肌收缩力加强时梗阻加重 B. 左室腔与左室流出道间压差加大时梗阻加重 C. 周围循环阻力下降时梗阻减轻 D. 二尖瓣前叶前移明显时梗阻加重
A. 20.4% B. 25.7% C. 21.9% D. 31.4%