导致急性主动脉瓣关闭不全的病因中最常见的是()
A.感染性心内膜炎
B.二叶主动脉瓣畸形
C.退行性主动脉瓣病变
D.风湿性心脏病
E.主动脉夹层
参考答案:A
--- May I visit you at 10 o’clock tomorrow morning?
--- I’m afraid I ______ a document for my boss then. What about 12:00?
A.am preparing
B.will have prepared
C.will be preparing
D.have been preparing
正常小腿筋膜间隔区组织压为()。
A.2.67kPa
B.1.33kPa
C.2kPa
D.1.6kPa
E.1.2kPa