过电压
参考答案：是指超过正常运行电压并可使电力系统绝缘或保护设备损坏的电压升高。
Recently, I bought a new apartment(公寓), _______ was high.
A．which price
B．the price of which
C．its price
D．the price of whose
钢丝绳是井下作业重要材料之一。
