某同学的体重是480N,他每只脚与地面的接触面积为160 cm2。这个同学

某同学的体重是480N,他每只脚与地面的接触面积为160 cm2。这个同学站立在水平地面上时,对地面的压强为  

    A.1.5×104 Pa    B3.0×104 Pa   C3.0×102Pa    D.1.5×102Pa

      

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