在现在这样复杂的社会里,防盗防灾已成为严重的问题。特别是对进入电子计算机室、研究室、特殊工作室等,以及对银行、公寓、出租大楼等的门户都有必要加以防护,对房门开闭应进 In such a complicated society as now, anti-theft disaster prevention has become a serious problem. In particular, access to electronic computer rooms, research laboratories, special studios, etc., as well as banks, apartments, rental buildings and other portals are necessary to be protected, the door should be opened and closed