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Revision as of 16:37, 29 December 2017 by Lx (talk | contribs) (Created page with "其中''P''=压强, ρ=密度, ''k''=体积模量.")

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${\frac {\partial ^{2}P}{dx^{2}}}=\left({\frac {\rho }{k}}\right){\frac {\partial ^{2}P}{\partial t^{2}}}$

或 ${\frac {\partial ^{2}\rho }{dx^{2}}}=\left({\frac {\rho }{k}}\right){\frac {\partial ^{2}\rho }{\partial t^{2}}}$

其中*P*=压强, ρ=密度, *k*=体积模量.

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