如图所示为某示波管内的聚焦电场实线和虚线分别表示电场线和等势线.则 A.场强ea>eb>ecb.电势ϕa>ϕbϕc>ϕbc.沿cba Template




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tomski如图所示为某示波管内的聚焦电场实线和虚线分别表示电场线和等势线.则 a.场强ea>eb>ecb.电势ϕa>ϕbϕc>ϕbc.沿cba coloring