[名词解释] 总产程

P-R间期正常为() ["A．0.12～0.20秒","B．0.14～0.18秒","C．0.16～0.20秒","D．0.10～0.18秒","E．0.11～0.13秒"] 第一产程的护理诊断是什么? 中隔导联V3和V4的主波应为() ["A．正波","B．负波","C．正负相等","D．正相波为主","E．等电位"] 胎头着冠 心电图纸以每秒25mm速度前移时，每小格代表() ["A．1秒","B．0.1秒","C．0.01秒","D．0.02秒","E．0.04秒"] 总产程