低压回路停电后，应在刀闸操作把手上悬挂“禁止合闸，有人工作”标示牌。
参考答案：对
She was greatly shocked at the scene before her eyes. Never did she expect that the local conditions ______ be so awful.
A．could
B．should
C．would
D．might
明朝与蒙古以长城为界各自为政，形成南北对峙（）余年的局面，到17世纪40年代才告结束。
