目前两台以上大容量UPS普遍采用冗余（）运行方式。
参考答案：并联
—It's dark (黑的) now, and I can't see anything.
—The light is behind the door, you can _________. [ ]
A. open it
B. turn on it
C. turn it off
D. turn it on
全身性瘙痒应与下列哪些疾病鉴别
A．湿疹
B．疥疮
C．痒疹
D．阴囊神经性皮炎
E．以上都是
