单选题 窦性P波振幅的正常值为
A．肢体导联＜0.25mV，胸前导联＜0.15mV
B．肢体导联＜0.20mV，胸前导联＜0.25mV
C．肢体导联＜0.25mV，胸前导联＜0.25mV
D．肢体导联＜0.25mV，胸前导联＜0.20mV
E．肢体导联＞0.25mV，胸前导联＜0.20mV