提早出现QRS波,时限>0.12秒,其前无相关P波()
A.房性期前收缩
B.交界性期前收缩
C.室性期前收缩
D.房性期前收缩未下传
E.交界性逸搏
参考答案:C
______ some of the questions ______,the man said good-bye to us.
A.Leave;unanswered
B.Leaving;unanswered
C.Left;to be answered
D.Leaving;unanswering
简述实时的FLD状态图中“TAG NUMBER”的功能。如何使用?