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【简答题】
送电线路电纳的意义是什么?
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举一反三
【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】架空绝缘配电线路放紧线过程中，应将绝缘线放在（）内。
A.
铁滑轮；
B.
铝滑轮；
C.
铝合金滑轮；
D.
塑料滑轮或套有橡胶护套的铝滑轮。
【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
相关题目：
【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】架空绝缘配电线路放紧线过程中，应将绝缘线放在（）内。
A.
铁滑轮；
B.
铝滑轮；
C.
铝合金滑轮；
D.
塑料滑轮或套有橡胶护套的铝滑轮。
【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
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