The paper expounds the principle and the method of measuring zenith distance for celestial positioning based on the direction of gravitational force line.
论述了在海上进行天文定位时以重力线作基准直接测定天体顶距的原理和方法。
The stresses in the glenoid fossa were the greatest in the back slope of the articular eminence. The regions of the greater compressive stresses of the mandible were those around the force line.
下颌骨较大压应力区位于力的作用线周围区域，较大拉应力区位于下颌支后部及下颌角附近区域。
The stresses in the glenoid fossa were the greatest in the back slope of the articular eminence. The regions of the greater compressive stresses of the mandible were those around the force line.
下颌骨较大压应力区位于力的作用线周围区域，较大拉应力区位于下颌支后部及下颌角附近区域。
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