典型心绞痛发作时,心电图的改变是()
A.P波高尖
B.异常Q波
C.ST段水平压低0.1mV以上
D.P-R间期延长
E.完全性右束支传导阻滞
参考答案:C
During the examination we are required to stay in our seats, keep our eyes on our work, to anyone.
A.instead of speaking
B.rather than speak
C.and not to speak
D.but would not speak
影响空间分辨力的因素很多,主要为________________、__________、_____________、___________、_______________、___________、_______________等