高压线路和设备的绝缘电阻一般不应低于100MΩ。
参考答案：错
The result was not the same as they had expected, ______ was rather disappointing.
A．that
B．which
C．when
D．what
三极管的发射结正向偏置，集电结反向偏置，则此三极管工作在（）。
A.截止区
B.饱和区
C.放大区
D.耗散区
