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【单选题】
以θ表示接触角,ρ表示水的密度,g表示策略加速度,h表示毛细管内液柱的调试,γ表面表面张力,r表示弯曲液面的曲率半径,则毛细管内水柱的高度h的计算公式为( )。A.
h=γcosθ/(rρg)
B.
h=2γcosθ/(rρg)
C.
h=γcosθ/(2rρg)
D.
h=2rγcosθ/(ρg)
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B.
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