下列哪项心电图改变为诊断陈旧心梗必要的（）

A.P波时限>0.12s
B.PtfV1绝对值为0.05mm.s
C.PⅡ、Ⅲ、aVF振幅≥0.25mv，P波高尖
D.Ⅱ、Ⅲ、aVF导联P波双峰，峰间距≥0.04s
E.P波形态圆钝，振幅在肢导<0.25mv，胸导<0.2mv

A.0.12-0.20s
B.0.10-0.20s
C.0.06-0.08s
D.0.32-0.44s
E.0.08-0.24s

A.V5/V6导联
B.V4-V6导联
C.V1/V2导联
D.V3/V4导联