21.如图为回旋加速器示意图其中置于高真空中的�属d形盒的半径为r两盒间距为d在左侧d形盒圆心处放有粒子源s匀强磁场的磁感应强度为b Template




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tomski21.如图为回旋加速器示意图其中置于高真空中的�属d形盒的半径为r两盒间距为d在左侧d形盒圆心处放有粒子源s匀强磁场的磁感应强度为b coloring