以下哪项是主动脉瓣关闭不全所致().
A.SAM现象
B.弓背样改变
C.钻石样改变
D.吊床样改变
E.二尖瓣前叶高频震颤
参考答案:E
其他条件不变的情况下,企业财务风险大,投资者要求的预期报酬率就高,企业筹资的资本成本相应就大。
In the International Code of signals,a group of three letters indicates().
A.urgency or an emergency
B.the vessel's national identity signal
C.a group from the general signal code
D.a group from the medical signal code