While he was investigating ways t improve the telescope Newton made _______discovery which completely changed ____ man’s understanding of color.

A．a ,/

B．a ,the

C．/, the

D．the ,a

“二尖瓣型P波”可见于多种病理状态，但不包括（）。

A.左心房肥大

B.右心功能不全

C.心房梗死

D.房间阻滞

E.慢性缩窄性心包炎