proper time interval

基本解釋

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.
目的探討QRS波群增寬時(shí)心室復(fù)極時(shí)間的判斷方法及如何對(duì)JT間期進(jìn)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;
減少澆筑層的水化熱溫升主要靠采用中低熱硅酸鹽水泥、較優(yōu)的混凝土配合比，并采取合理的層厚、間歇期和初期通水冷卻等措施來(lái)達(dá)到；