下列先天性心脏病,频谱呈双期连续性分流的病变是()。
A.房间隔和室间隔缺损
B.完全性心内膜垫缺损
C.法洛四联症
D.艾森门格综合征
E.动脉导管未闭、主动脉窦瘤破裂
参考答案:E
一I had a great time in Swiss last winter.I went skiing with my friends
—Wow! .
A.Sounds really cool!
B.Cheers!
C.How interesting you are!
D.I’II go there.too.
在0℃和101 kPa的条件下,将4.00 g氩气、1.40 g氮气和1.60 g氧气混合,该混合气体的密度是相同条件下氢气密度的( )
A.35倍
B.17.5倍
C.7倍
D.14倍