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Pa+(h1-h2)*rou(Ccl4)*g=P2
P3=P2+(h2-h3)*rou(x)*g
P3=Pb+(h4-h3)*rou(Hg)*g
求一元一次方程就可
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Pa+(h1-h2)*rou(Ccl4)*g=P2
P3=P2+(h2-h3)*rou(x)*g
P3=Pb+(h4-h3)*rou(Hg)*g
求一元一次方程就可