如图所示一质点沿半径为r的半圆运动当质点由a点运动到b点时其位移的大小和路程分别 A.2r2rb.2rπrc.2r2πrd.r Template




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tomski如图所示一质点沿半径为r的半圆运动当质点由a点运动到b点时其位移的大小和路程分别 a.2r2rb.2rπrc.2r2πrd.r coloring