部分型肺静脉畸形引流的血流动力学改变与下列哪个病变相似()
A.动脉导管未闭
B.肺动脉瓣狭窄伴房间隔缺损
C.房间隔缺损
D.法洛四联征
E.以上都不是
参考答案:C
It seemed that little________had been paid to the girl's illness in the last few years. [ ]
A. awareness
B. energy
C. attention
D. observation
电视解调器是将电视射频信号解调成()和音频信号。