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СǿͬѧҪѹΪ2.5 VСݵĹʣ
(1)ӵIJʵ·ͼʾñʻߴ浼ߣʵ·____
(2)·պϿغݲѹʾҽӽԴѹָ뼸һԭ_______
(3)ųϺƶƬPijһλʱѹʾͼʾҪСݵĶʣӦƬP_______ABƶʹѹʾΪ_______V
(4)ƶƬP¶Ӧĵѹ͵ʾƳͼʾIUͼͼϢɼСݵĶ_______W۲ͼʾģIUͼֱߵԭ_______
(5)̽ѹĹϵҪʵ_______
(6)ʱֻPBֱPCȣԭ_____________________.
ݴ· B 2.5 0.75 ˿ĵ¶ȵ߶ ֵ PBֺPCִȣPBֱPCֵĵݽQI2Rtͨͬ£PBֲ϶࣬Խ (1)ҪѹΪ2.5 VСݵĹʣѹӦݲѹʹС̼ɣӵѹĸݵˣӵѹġ3VݵҶˣ...鿴𰸺ͽ>>
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СҵԡĶΪ2000 Wˮ50 kgˮעˮԡ40 minԡ¶ȼʾ2242 [cˮ4.2103 J/( kg)]
(1)˹ˮˮյ
(2)õԡʱЧʣ
(1)4.2106 J (2)87.5% 1ˮյ Q=cmt=4.2103J/kg•棩50kg42橁22棩=4.2106J 2ˮĵĵܣ W=Pt=2000W4060s=4.8106J ԡʱЧʣ =100%=100%=87.5% ...鿴𰸺ͽ>>
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1ֻպS0ʱR0˵ĵѹ
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B. ƾʱƵĹʵҵƵĹ
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D. ƴڸõԴϣȻҵ
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ͼʾĵ·еԴѹ䣬S1ѾպϣٱպϿSʱ
A. ѹʾС B. ʾС
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A. 4W B. 4W C. С4W D. ȷ
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A. ԴѹΪ12V B. R0ֵΪ40
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B. ֶ··ط
C. ֶ··ط
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A A. ݴֶ··طã·ȻͨģʾA B. ֶ··طã··ѹʾBȷ C. ֶ··طã··ѹʾBȷ D. ӵԴֶ··طõ··ѹʾBȷ ...鿴𰸺ͽ>>
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