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为建立后置物射出口与射入口的检验鉴定方法，使用国产五四式7．62mm口径手枪及五六式7．62mm口径半自动步枪，以5米的距离射击约克夏种白猪18只，同时以木板、水泥板、玻璃及衣服等作为射出口衬垫物，制成后置物射出口56例，并与对照组12例射出口进行对比观察。结果表明，射出口与后置物距离在3cm以内均可出现创缘伸展轮及皮下出血，且与后置物质地及距离成正比。根据其形态分为典型及非典型两类，并建立了此类射出口的检验方法及其与射入口鉴别的依据，有助于法医在实际检验中对射击方向的判断。
In order to establish the method of inspection and identification of the exit and entrance of posterior material, a total of 18 Yorkshire white pigs were shot at a distance of 5 meters using a homemade 54-type 7.62mm caliber pistol and a 56-type 7.62mm caliber semi-automatic rifle, Wood board, cement board, glass and clothes were taken as the exit liner to make 56 cases of the exit of the posterior material, and compared with the 12 exit of the control group. The results show that the exit port and the posterior material within the distance of 3cm can occur edge stretching wheel and subcutaneous hemorrhage, and the posterior material and the distance is proportional to. According to its morphology is divided into two types of typical and atypical, and the establishment of such a test method of injection port and the basis for the identification of the entrance to help forensic in the actual test of shooting direction.