许多命题都是由______ 和______ 两部分组成。其中题设是____________ ,结论是___________。
题设,结论,已知事项,由已知事项推出的事项
–Have you ever traveled abroad?
--Sure. I ____ the language of English in the USA two years after I graduated from the university.
A.used to learn
B.was used to studying
C.have studied
D.didn’t use to study
做Valsalva动作时,哪种杂音增强
A.二尖瓣狭窄
B.肥厚型梗阻性心肌病
C.二尖瓣关闭不全
D.主动脉瓣狭窄
E.主动脉瓣关闭不全