交界性早搏的心电图表现是()
A.有窦性P′波
B.QRS>0.12s
C.代偿间期常完全
D.偶联间期常固定
E.提前出现的QRS波群,逆行P′波可有可无
参考答案:C, D, E
There are many ______ to the Great Lakes every year. They go to enjoy the great nature.[ ]
A. doctors
B. teachers
C. visitors
D. passengers
在创造活动中,突然出现的一种短暂的最佳创造心理是指
A.思维
B.美感
C.直觉
D.灵感