一个人先在水平地面上行走,然后又站立在地面上,则地面受到的压

一个人先在水平地面上行走,然后又站立在地面上,则地面受到的压力、压强 ……(  )

    A.压力、压强均不变                     B.压力、压强均变小

    C.压力不变 ,压强变小                  D.压力变小,压强变小

答案

C

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