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﹣The winner of Academy Honorary Award (奥斯卡终身成就奖) to be Jackie Chan this year. ﹣Well,he deserve...
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如图△ABC为等边三角形∠ABC∠ACB的平分线交于点OBO与CO的垂直平分线与BC分别交于EF两点求证BE=EF=FC.
白炽灯是日常生活中最重要的光源小明对图甲所示的白炽灯和灯口进行了仔细观察后结合所学的有关知识明白了许多道理1在家庭电路中它与其他用电器之间是联灯尾金属块必须与线相连这些措施为了安全用电的需要2白炽灯用久了会发暗其原因主要是灯丝升华变细电阻在电压不变时实际功率选填变大变小或不变.3图乙是光明牌白炽灯的铭牌则25W表示.它正常工作20h消耗的电能是kW·h.
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如图18-F-14甲所示电源电压保持不变闭合开关S滑动变阻器滑片P从a端移至b端的整个过程中电流表示数I与电压表示数U的关系图象如图乙所示由图象可知R1的阻值为Ω当电路中的电流为0.2A时R1与R2消耗的电功率之比为.
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