山东省高校证据鉴识重点实验室山东政法学院开放课题No.KFKT-201403;山东政法学院科技计划项目No.2014F15BSupported by the Opening Project of Shandong Provincial Key Laboratory of Evidence Identification in Colleges and Universities,Shandong University of Political Science and Law No.KFKT-201403 and the Science and Technology Planning Project of Shandong University of Political Science and Law No.2014F15B