一人先站在地面上后又在地面上走动则他对地面的压力和压强是dda.压力减小压强不变 b.压力压强都增大c.压力压强都不变 d.压力不变 Template




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tomski一人先站在地面上后又在地面上走动则他对地面的压力和压强是dda.压力减小压强不变 b.压力压强都增大c.压力压强都不变 d.压力不变 coloring