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17.三.多项选择题(共16分,每小题4分,每小题有二个或三个正确选项,全选对的,得4分,选对但不全的,得2分,有选错或不答的,得0分,答案涂写在答题卡上。)直流电路如图所示,在滑动变阻器的滑片P向右
問題詳情
17.三.多项选择题(共16分,每小题4分,每小题有二个或三个正确选项,全选对的,得4分,选对但不全的,得2分,有选错或不答的,得0分,答案涂写在答题卡上。)直流电路如图所示,在滑动变阻器的滑片P向右移动时,电源的( )
(A)总功率一定减小 (B)效率一定增大(C)内部损耗功率一定减小 (D)输出功率一定先增大后减小
參考答案
答案:A,B,C
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)
上一篇 :
16.如图,可视为质点的小球A、B用不可伸长的细软轻线连接,跨过固定在地面上半径为R有光滑圆柱,A的质量为B的两倍。当B位于地面时,A恰与圆柱轴心等高。将A由静止释放,B上升的最大高度是( )(A)2
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27. When I first met Byan I didn't like him, but I _______ my mind.(A)have changed (B) change (
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