proper time interval

基本解释

Objective To evaluate the effects of prolongation of the QRS on cardiac repolarization time and seek for a proper formula for correction of the JT interval for heart rate.
目的探讨QRS波群增宽时心室复极时间的判断方法及如何对JT间期进行校正。
The former is reached mainly by adopting the Portland cement with middle or low heat, proper mix proportion of concrete, rational layer thickness, rational time interval and initial cooling of water;
减少浇筑层的水化热温升主要靠采用中低热硅酸盐水泥、较优的混凝土配合比，并采取合理的层厚、间歇期和初期通水冷却等措施来达到；