某点平面应力状态如图所示,则该点的应力圆为:()
A.一个点圆
B.圆心在原点的点圆
C.圆心在(5MPa,0)点的点圆
D.圆心在原点、半径为5MPa的圆
参考答案:D
男,26岁,无症状。查体:心界正常,心率80次/分,期前收缩1~3次/分,心音正常,无杂音。心电图示室性期前收缩,处理措施是
A.美托洛尔
B.美西律
C.胺碘酮
D.不予药物治疗,定期复查
E.莫雷西嗪
—I'm going to study engineering in Tsinghua University tomorrow. —().
A.All the best in your study
B.All the best with your study
C.All the best in your business
D.All the best in your new job