optimal tangent-angle 最优切向角
sounding tangent angle method 测深曲线切线角度法
tangent of an angle 角的正切
dielectric loss angle tangent 介电损耗角正切 ; [电] 介质损耗角正切
tangent of helix angle 导程角正切 ; [机] 螺旋角切线
At unstable state the formula of calculating unstable time using tangent Angle is established.
对于失稳的情况，建立了用割线角估算失稳时间的一般公式。
In the unstable circumstances, the general formula of calculating unstable time with tangent Angle is established.
对于失稳的情况，建立了用割线角估算失稳时间的一般公式。
In this paper base tangent length is put forward and lead angle calculating formula is deduced.
这篇文章提出了公法线长度并推导出超前角的计算公式。
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