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××牌94厘米液晶彩色电视机
额定电压220V
频率50Hz
功率200W
表所示是小红家电视机的铭牌,该电视机正常工作时的电压为    伏,功率是    瓦,电视画面中的多彩颜色是由蓝、    、红三种色光组成.2011年3月召开的两会盛况电视报道是通过    向全世界传播的.(选填“声波”或“无线电波”)
【答案】分析:掌握电视机铭牌上参数的含义.
电视机彩色画面是由光的三原色红、绿、蓝合成的.
声不能在真空中传播,电磁波可以在真空中传播.
解答:解:电视机铭牌上220V表示电视机正常工作电压是220V,额定功率是200W.
电视画面由光的三原色红、绿、蓝合成.
两会盛况是通过卫星通信来转播的,太空中是真空,声波不能在真空中传播,卫星通信依靠电磁波传递信息.无线电波是一种电磁波.
故答案为:220;200;绿;无线电波.
点评:本题通过电视机来考查了声、光、电三部分内容,跨越比较大,但是知识点是比较简单的.
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