一个变电站的电容器、电抗器等无功调节设备应按()来投退。
A.电流
B.电压
C.有功
D.无功
参考答案:B
______to some parts of South America is still difficult, because parts of the continent are still covered with thick forests.
A.Orientation
B.Access
C.Procession
D.Voyage
2008年11月初,重庆出租车停运风波,既是公关危机,又是危机公关。