案情赵某，男，15岁，中学生。1996年11月21I日下午，被人发现缢死于其家未完工的房屋内。现场门窗关闭，未上锁，不乱。索套为软质尼龙绳，呈单环状，搭挂在一木质横杆上，形成一高一低两个开放性套环。上端套环距地高约180cm，下端套环距地高约60cm。头颈位于上端的套环内， Case Zhao, male, 15 years old, middle school student. On the afternoon of the 21st of November, 1996, it was discovered that he had died in the unfinished house of his family. Site doors and windows closed, not locked, not chaos. Rope for the soft nylon rope, was a single ring, hanging on a wooden bar, forming a high and one low two open collar. The upper ring is about 180cm above the ground and the lower ring is about 60cm above the ground. Head and neck located in the top of the ring,