问题 单项选择题

有一条100km的220kV输电线路,线路每公里的参数r0+jx0=0.08+j0.33Ω,b0=2.85×10-6S,已知首端实际电压为230kV,末端送出功率为80+j40MVA,则首端送出功率和末端电压为()。

A.79.34+35.23MVA;220kV

B.81.239+j38.19MVA;216.21kV

C.83.456+j42.135MVA;214.23kV

D.85.321+j40.126MVA;218.13kV

答案

参考答案:B

阅读理解

阅读理解。

     When I was a little girl, my mom would say, "Half the fun of doing anything is sharing it with others."

   1   Friends and mates allow us to enjoy our successes and our joys, comfort us in our hard moments,

and provide a mirror for us to learn more about ourselves. I've always looked at friends as the family we

choose. They enrich our lives. As Robert Louis Steven once said, "  2  "

     To be a good friend or partner, it's important to be a good listener. Hear what your friend or mate has

to say first rather than jump to conclusions or get defensive.   3   When they hear their words repeated

back to them, it can help them to realize what they said was not exactly what they meant to say. 

       4    You know the old golden rule,"Care for others the way you would like them to care for you." The

support of a friend during a tough time could make the difference between success and failure.

Encouragement and confidence are the gifts that can help change a person's life.

     Take care, though, with whom you choose to have close relationship, for they can have a great effect

on yourself-respect and life path. As someone once told me,"   5   They will either take you up or down."

A. I am afraid so.

B. It is quite true.

C. Friendship is the most important factor.

D. Sometimes it is useful to be their mirror.

E. A friend is a present which you give yourself.

F. The attitudes of your friends are like the buttons on a lift.

G. Patience, sympathy and understanding are also important qualities.

单项选择题