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【单选题】
我国目前电力系统的最高电压等级是( )A.
交流500kV，直流500kV
B.
交流750kV，直流500kV
C.
交流500kV，直流800kV
D.
交流1000kV，直流800kV
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【简答题】0305-2图片中 A=120, B=4, C=65, D=22, E=40, F=32, G=15 体积是多少( ) A=150, B=5, C=80, D=22, E=40, F=32, G=15 体积是多少( )
【简答题】纵断面图上的填挖高度等于()与()之差。
【单选题】In the author's opinion, ______.
A.
learning plays an important part in most aspects of a child's development and change
B.
there are hardly any principles of learning which are generally accepted
C.
a child never learns anything unless he has some need or desire for it
D.
a child should not be rewarded until he has learned a response
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