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本文介绍了用油浸双折射法检验不同厂家相同细度和同一厂家不同细度同种纤维 的双折射值的情况，为今后应用该方法办案提供了参考依据。
In this paper, the birefringence values of different manufacturers with the same fineness and different fineness and same fiber from different manufacturers are examined by oil immersion birefringence method, which provides a reference for future application of this method.