The experimental result indicated that: in stretch process, in identical test specimen the strain value on metal substrate and contact surface are same, the mark is opposite.
实验结果表明：在拉伸过程中，同一试样中金属基体上和界面上的应变数值相同，符号相反。
It may also be useful to test the same nerve in the limb opposite the symptomatic one to exclude any preexisting nerve injury that is asymptomatic.
有时也可以通过检查对侧同一个神经，排除病人原来就有，而又无特别症状的神经损伤。
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