将重为7.5牛,边长为5厘米的正方体金属块放在40平方厘米的水平木板表面上,则金属块对木板的压强?A.可能是2.0*10的3次方帕B.可能是2.5*10的3次方帕C.一定是3.0*10的3次方帕D.可能是4.5*10的3
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![将重为7.5牛,边长为5厘米的正方体金属块放在40平方厘米的水平木板表面上,则金属块对木板的压强?A.可能是2.0*10的3次方帕B.可能是2.5*10的3次方帕C.一定是3.0*10的3次方帕D.可能是4.5*10的3](/uploads/image/z/14817906-18-6.jpg?t=%E5%B0%86%E9%87%8D%E4%B8%BA7.5%E7%89%9B%2C%E8%BE%B9%E9%95%BF%E4%B8%BA5%E5%8E%98%E7%B1%B3%E7%9A%84%E6%AD%A3%E6%96%B9%E4%BD%93%E9%87%91%E5%B1%9E%E5%9D%97%E6%94%BE%E5%9C%A840%E5%B9%B3%E6%96%B9%E5%8E%98%E7%B1%B3%E7%9A%84%E6%B0%B4%E5%B9%B3%E6%9C%A8%E6%9D%BF%E8%A1%A8%E9%9D%A2%E4%B8%8A%2C%E5%88%99%E9%87%91%E5%B1%9E%E5%9D%97%E5%AF%B9%E6%9C%A8%E6%9D%BF%E7%9A%84%E5%8E%8B%E5%BC%BA%3FA%EF%BC%8E%E5%8F%AF%E8%83%BD%E6%98%AF2.0%2A10%E7%9A%843%E6%AC%A1%E6%96%B9%E5%B8%95B%EF%BC%8E%E5%8F%AF%E8%83%BD%E6%98%AF2.5%2A10%E7%9A%843%E6%AC%A1%E6%96%B9%E5%B8%95C%EF%BC%8E%E4%B8%80%E5%AE%9A%E6%98%AF3.0%2A10%E7%9A%843%E6%AC%A1%E6%96%B9%E5%B8%95D%EF%BC%8E%E5%8F%AF%E8%83%BD%E6%98%AF4.5%2A10%E7%9A%843)
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