银钎焊的阀门套管的内部直径的机械公差和表面光滑度要求非常精确，以确保有足够的附着力。
The interior dimensions of silver brazing valve sockets are machined to the closest tolerances and finished smooth to promote full capillary attraction .
结果不同印模材料采印及灌注的普通石膏模型，人造石和超硬石膏模型，其表面光滑度及硬度均有所差异。
Results There had difference on the surface smoothness and hardness of models made with different impression materials and different model materials.
方法：以滴丸的硬度、外观、表面光滑度、水飞蓟宾的含量为评价指标，采用正交试验法研究滴丸成型的最佳工艺条件。
Methods: the optimum preparation condition were researched by orthogonal test according to the hardness of drop pills, appearance, smooth and the content of silybin.
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