方法测量11例骨性下颌前突伴偏斜患者治疗前模型，将上颌腭中缝作为中线标准，测量牙弓两侧同名牙接触点到腭中缝的距离，观测牙弓的对称性。
Methods Measurement of 11 dental models was performed, midline of palate was defined as central line, the distance of every contact point to the midline was measured in each side.
这种方法在测量非常小的样品时特别有用，因为这时样品的尺寸和接触点的距离并不重要。
This method is particularly useful for measuring very small samples because the dimensions of the sample and the spacing of the contacts are unimportant.
本文采用两种实验方法对比测量可知通常的导线连接其接触点的电阻，并由此进行分析，阐述在双电桥测量低电阻实验中四端扭接法的必要性。
Henceforth, the article analyzes the necessity of the mode of the 4-terminal connection in the experiment of low resistance measurement using the double bridge.
本文采用两种实验方法对比测量可知通常的导线连接其接触点的电阻，并由此进行分析，阐述在双电桥测量低电阻实验中四端扭接法的必要性。
Henceforth, the article analyzes the necessity of the mode of the 4-terminal connection in the experiment of low resistance measurement using the double bridge.
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