The job of the timing belt is to turn the camshaft ( s ) at exactly 1 / 2 the speed of the crankshaft while maintaining a precise alignment 正时皮带的工作是:当保持精准定位时调整凸轮轴的运转速度为曲轴速度的一半
2.
We demonstrate experimentally the technique to fabricate large does in the thick film on a concave lens ( mirrors ) surface with precise alignment by using the strategy of exposure twice 采用两次曝光的方法在凹透镜表面上厚光刻胶中制作衍射光学元件。
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4 . under given conditions the alignment was finished before the torpedo was launched with the precise alignment method of fixed base alignment . after being launched the strapdown matrix was updated by quaternion algorithm 在给定条件下，选用静基座组合对准方法中的精对准方法，完成了鱼雷发射前的初始对准工作；鱼雷发射出去后，采用四元数法进行了捷联矩阵的更新。
