符合交界性期前收缩心电图表现的是

• A、P-R′间期＜0.12s
• B、P′-R间期≥0.12s
• C、P′-R间期≤0.21s
• D、R-R间期≤0.21s
• E、R-P′间期＜0.20s

符合房性期前收缩心电图表现的是

• A、P-R′间期＜0.12s
• B、P′-R间期≥0.12s
• C、P′-R间期≤0.21s
• D、R-R间期≤0.21s
• E、R-P′间期＜0.20s