A. 具有足够的操作功 B. 具有高度的可靠性 C. 动作迅速,即断路器分、合闸动作要快 D. 结构简单、尺寸小、重量轻、价格低廉
A. 正确 B. 错误
A. Two days. B. The whole afternoon. C. A whole day. D. The whole morning.