心脏瓣膜病最常见受累部位是()
A.主动脉瓣
B.室间隔
C.二尖瓣
D.肺动脉瓣
E.三尖瓣
参考答案:C
I always ____________ a T-shirt to play basketball.[ ]
A. wear
B. put on
不连续单元格的选取,可借助于键完成。()
A.Ctrl
B.Shift
C.Alt
D.Tab