什么叫磁致伸缩效应?
参考答案:
磁致伸缩效应是1842年由焦耳发现的,故又称焦耳效应
磁性材料由于磁场的变化,其长度和体积都要发生微小的变化,这种现象称为磁致伸缩。
患者女性,58岁,风心病房颤2年。清晨起床自行上厕所时摔倒,家人发现其口角歪斜,自述左侧上下肢麻木。送医院检查,神志清楚,左侧偏瘫,CT见低密度影。该病人当前的主要护理措施是
A.心理护理,减轻焦虑
B.观察生命体征变化
C.记录出入量
D.输营养药
E.头不用冰袋冷敷
Each life preserver must be readily accessible to the person for whom it is intended while he or she is().
A.at work,only
B.in his or her berthing area,only
C.BOTH at work and in his or her berthing area
D.None of the above