关于非阵发性房室交界区性心动过速错误的是（）。 A.最常见的原因是洋地黄中毒 B.发

夏、商、西周时期，我国青铜文明有哪些表现？

_______________________________________________________________________

-----Did you have a hard time traveling back home?

-----Yes, it ______ for four days when I arrived in Guiyang and all the roads______ covered with ice.

A．snowed, were

B．was snowing, had been

C．had been snowing, had been

D．had snowed, were

到黄昏视力明显减退多为

A．气虚
B．肝虚
C．肾亏
D．痰阻

.装有SF6设备的配电站，应装设强力通风装置，风口应设置在（），其电源开关应装设在门外。

A.室内中部

B.室内顶部

C.室内底部