标签:security fence
Posted in 业界观察
Security in History: June 25, 1867 Barbed Wire
K.T. Sima 2022年6月25日
June 25, 1867 – USA Lucien B. Smith of Kent, Ohio, patented barbed wire (or barb wire). Barbed…
Understanding 9/11: Why 9/11 Happened & How Terrorism Affects Our World Today
2018-09-11
今天是9/11事件17周年纪念日。报名了一门相关在线课程,以作纪念。 课程名:U...