常見例句Therapy with phentolamine produced a significant decrease in the preejection period index. 用酚胺唑啉治療，能使噴射前期指數(shù)大大降低。left ventricular preejection period 左室射血前期right ventricular preejection period 右室射血前期ratio of preejection period to left ventricular ejection time 射血前期與左室射血時間比率preejection period (PEP) 排血前期 返回 preejection