通信卫星上的转发器实际上是一套() ["A.宽带收发信机","B.宽带接收机","C.宽带发射机","D.宽带交换控制设备"]
电容器从电网断开需放电,高压电容器多用()做放电电阻- ["电压互感器线圈;","电流互感器线圈;","变压器;","电阻."]
哪些受热面工作条件差?提高烟气流速的利与弊?
电力电容器在额定电流下运行,允许过载电流不得超过额定电流的1.3倍,以免发生(). ["爆炸;","放电;","热击穿;","触电."]
衡量地球站接收信号能力的参数是() ["A.接收信号功率","B.G\/T值","C.EIRP","D.接收天线增益"]
机组在“功率控制方式”下的负荷调节方法?