急性局限性前壁心肌梗死。心电图特征性改变见于下列哪组导联()。
A.V1、V2、V3
B.V3、V4、V5
C.V1-5
D.Ⅰ、V1、V5、V6
E.Ⅱ、Ⅲ、aVF
参考答案:B
If you often feel tired and can't focus your attention, that is________you have to stop working too
hard and to have a rest.[ ]
A. why
B. whether
C. when
D. what
行为科学将个人因素、环境影响与行为之间的关系用下面()公式表示。
A.行为=个人因素+环境影响
B.行为=个人因素×环境影响
C.行为=个人因素/环境影响
D.行为=f(个人因素,环境影响)