传导速度最快的是（）
A.窦房结
B.心房肌
C.房室交界
D.浦肯野纤维
E.心室肌
参考答案：D
— She has gone abroad,______?
—No. She is still teaching us English at our school now.[ ]
A. is she
B. isn't she
C. has she
D. hasn't she
虎斑心见于（）
A．纤维素性心包炎
B．风湿性心肌炎
C．心肌退行性病变
D．心肌脂肪变性
