单项选择题
A.≥2.5mV B.≥2.0mV C.≤3.0mV D.＜2.5mV
A.＞本导联R波1/4振幅，时限＞0.04s B.≥本导联R波1/10振幅，≥0.20s C.≤本导联R波振幅1/2，≤0.04s D.≤本导联S波振幅，≥0.10s
A.0.06～0.20s B.0.06～0.11s C.0.08～0.20s D.0.06～0.18s
A.＜0.15s B.＜0.05s C.≤0.11s D.≤0.20s
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