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Everyobjecthasweight.Butthecenterofitsweightisnotalw...
问题详情: Everyobjecthasweight.Butthecenterofitsweightisnotalwaysinthemiddleoftheobject.Ifthetopofanobjectisheavierthanitsbottom,itwillfallovereasily.Wesaythatitscenterofgravity(引力)ishigh.Butifthe...