二维彩超测定的射血分数（EF）大于实际射血分数的心脏瓣膜病变是（）。

A.主动脉关闭不全

B.二尖瓣关闭不全

C.二尖瓣狭窄

D.肺动脉瓣狭窄

E.主动脉瓣狭窄

A customer is not happy with a project deliverable. What is your BEST course of action

A．Tell the customer it meets the scope of work and get the customer's agreement to procee

B．Determine why the customer is unhappy with the deliverabl

C．Meet with the team to determine changes neede

D．Meet with the customer and offer a substitute project deliverabl