50×30×0.5
    3+1
    250*200
    (139.53×10^3×8.314×(80.9+273.15))/((4+101.325)×10^3×3600)
    0.712×√(2.153+9.742*(0.006^(2/3)))
    0.712×√(2.153+9.742*(0.005^(2/3)))
    0.712×√(2.153+9.742*(0.004^(2/3)))
    0.712×√(2.153+9.742*(0.003^(2/3) ))
    0.472+2533*0.006^2+11.28*(0.006^(2/3))
    0.472+2533*0.005^2+11.28*(0.005^(2/3))
    0.472+2533*0.004^2+11.28(0.004^(2/3))
    0.472+2533*0.003^2+11.28(0.003^(2/3))
    0.153(1/(0.8×0.027))^2
    0.051×(1/(0.84×0.097))^2 *(12.68/796)
    2.33-8.376(0.006^(2/3)) =
    2.33-8.376(0.005^(2/3)) =
    2.33-8.376(0.004^(2/3)) =
    2.33-8.376(0.003^(2/3)) =
    e（-7.35）
    0.623×√(2.102+10.812*(0.006^(2/3)))

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