主动脉瓣关闭不全X线检查的特征是（）
A.右心室增大
B.心腰凸出
C."摇椅式"搏动
D.肺门舞蹈
E.上腔静脉增宽
参考答案：C
“___________ do you spend on your homework every day, boys?”
“About two hours.”
A．How much time
B．How often
C．How long
D．A and C
食医合一
