The fibrous skeleton of heart includes which of the following structures.
A.fibrous ring of aortic orifice(主动脉瓣环) B.fibrous ring of orifice of pulmonary trunk (肺动脉瓣环) C.fibrous rings of left and right atrioventricular orifices D.left fibrous trigone （左纤维三角） E.central fibrous body (中心纤维体)正确答案ABCDE
