鉴别心肌梗死与心绞痛最有意义的心电图改变是()
A.ST段抬高
B.T波倒置
C.病理性Q波
D.冠状T波
E.ST段降低
参考答案:C
There are several periods in a computer, the longest period is
A.Instruction period
B.Machine period
C.Beat period
D.CPU period