要分析各种外力,分力,张量,张向各方向
比如切线,法线,圆周运动时,不要一涨,一跌,就心动,要先分析,向量运算
要分析各种外力,分力,张量,张向各方向
比如切线,法线,圆周运动时,不要一涨,一跌,就心动,要先分析,向量运算
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