心脏骤停的诊断标准是什么?
参考答案:
①神志突然丧失;②大动脉搏动消失;③心音消失;④呼吸断续或停止;⑤发绀;⑥瞳孔固定散大。以上六条以前两条最重要,据此即可确诊。
History is ( ) a subject that only lets us know something in history; it also tells us a lot of truth.
A. less than B. more thanC. no more than D. not more than
心房颤动时f波的频率为()
A.300~600次/分
B.250~350次/分
C.350~600次/分
D.100~160次/分
E.250~600次/分