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【单选题】
4.77. 第77灾害发生后，若需对配电线路、设备进行巡视，应得到（ ）批准。
A.
设备运维管理单位领导
B.
设备运维管理单位
C.
工作负责人
D.
值班调控人员
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参考答案：
参考解析：
刷刷题刷刷变学霸
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【单选题】某高压输电线的波阻抗Zc= 380∠- 60°Ω，在终端匹配时始端电压为U1=147kV,终端电压为U2 = 127kV,则传输线的传输效率为（）。
A.
64.4%
B.
74.6%
C.
83.7%
D.
90.2%
【单选题】Subways are underground trains, which usually operate 24 hours a day. They are found in larger cities and usually run between the suburbs and the downtown area. Maps and schedules are available from t...
A.
within downtown areas
B.
away from city centers
C.
in or outside big modern cities
D.
between suburbs and city centers