Recently people have made great progress in using ______ power of nature to produce ______ electricity.

A．a; the

B．/ ; /

C．the; /

D．a; an

主动脉瓣狭窄的病理生理不包括（）

A.心肌耗氧量增加

B.左室压力超负荷

C.左室顺应性增加

D.心排血量减少

E.心内膜下缺血