如图所示质量为m的小球悬挂在质量为m的半圆形光�轨道的顶端台秤的示数为m mg.忽略台秤秤量时的延迟因素则从烧断悬线开始到小球滚到 Template




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tomski如图所示质量为m的小球悬挂在质量为m的半圆形光�轨道的顶端台秤的示数为m mg.忽略台秤秤量时的延迟因素则从烧断悬线开始到小球滚到 coloring