Austin-Flint杂音的发生与下列哪项有关()
A.血流加速
B.肺动脉高压
C.左心房巨大血栓形成
D.主动脉瓣狭窄
E.主动脉瓣关闭不全
参考答案:E
小败毒膏
A.微波干燥养护法B.远红外加热干燥养护法C.蒸汽加热养护技术D.气体灭菌养护技术E.辐射灭菌养护技术
The boy _____ lost his backpack has to borrow books from his teachers. [ ]
A. who
B. whose
C. which