如图所示轻弹簧一端固定在竖直墙上的p点弹簧与竖直墙面的夹角为30°另一端系在质量为m的�块上.�块静止在倾角为30°的粗糙斜面上则 Template




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tomski如图所示轻弹簧一端固定在竖直墙上的p点弹簧与竖直墙面的夹角为30°另一端系在质量为m的�块上.�块静止在倾角为30°的粗糙斜面上则 coloring