网桥的作用是将两个或两个以上网络连接起来，形成网中之网。网桥的种类分为两种：1）内部网桥；2）外部网桥。
查看答案
新建或大修后的架空电力线路交验后在运行前应确定线路相位。
A. 对
B. 错
电力线路故障巡视主要是查明线路接地事故及跳闸原因，找出故障地点。
A. 对
B. 错
Which method should be used to warm up the pump turbines prior to discharge（）.
A. Lock the turbine rotor and slowly bleed in steam until operating temperature is reached
B. Run the pump at high speed with the discharge valves closed
C. Run the turbine at slow speed with the pump disconnected
D. Shut the discharge valve and run the pump at slow speed
微信支付 
支付宝支付