如图所示用长为l的细线拴一个质量为m的小球使小球在水平面内做匀速圆�运动细线与竖直方�间的夹角为0关于小球的受力情况下列说法正确的是 Template




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tomski如图所示用长为l的细线拴一个质量为m的小球使小球在水平面内做匀速圆�运动细线与竖直方�间的夹角为0关于小球的受力情况下列说法正确的是 coloring