目的探讨中青年与老年脑卒中患者发病的危险因素及自护行为水平。
Objective To investigate the dangerous factors and self-nurse level of middle-young and elderly patient with stroke.
目的分析和比较中青年与老年急性心肌梗死(ami)患者的危险因素，发病诱因、临床特点及冠脉病变特点。
Objective to analyze risk factors, predisposing inducements, clinical symptoms, lesion of coronary arteries in different age groups with acute myocardial infarction (AMI).
目的：对老年猫与青年猫视网膜的变化进行比较研究。
Objective: To study the morphological changes of retina in old and young cats.
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