三尖瓣波群
参考答案:
三尖瓣波群:在胸骨旁四心腔图检查时选择经过三尖瓣前叶的取样线,可见一活动幅度较大的双峰曲线,距体表较近(5cm左右),为三尖瓣前叶的反射。
一只口袋中放着6只红球和4只白球,现从口袋中随机摸一只球,则摸到白球的概率是
He was about to tell me the secret _____ someone patted him on the shoulder. [ ]
A. as
B. until
C. while
D. when