But now the use of the spherical one-cone bit shows that the teeth are abrade heavily in advance, which affects the velocity and life of the bit.
但是目前油田上使用的球形单牙轮钻头由于牙齿先期磨损严重，影响了钻头的机械钻速和寿命。
The studying results show that the classical elastic wave equation of spherical wave is only true for fixed amplitude phase and described only kinematic equation of phase velocity.
研究揭示经典的球面波波动方程只对固定振幅相成立，即只描述了相的运动方程，其波速为相速度。
The reasons for error cut-in grinding of cage spherical outside surface of ball basket constant velocity joint is analyzed, and the solution for the problem is put forward.
分析了球笼式等速万向节保持架外球面切入磨削误差产生的原因，并提出解决和调整方法，从而进一步推导出调整计算式。
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