下列方法能用于鉴别蒸馏水和硬水的是 [ ]
A.加热蒸发
B.加肥皂水
C.测导电性
D.观察颜色
答案:B
--- What’s wrong with my son, doctor?
--- ____________ serious, just a slight cold. He’d better drink some water.
A.Everything
B.Nothing
C.Something
D.Anything
如果左心和降主动脉提前显影,则一般会存在()。
A.右至左分流
B.左至右分流
C.三尖瓣反流
D.主动脉瓣反流
E.肺动脉瓣反流