In order to ensure normal teaching order, prote cting st ude nts ' healt hy growth, e nsuring that national (property) is not l ost, to preve nt or minimize t he occurrence of safety accide nts, follow the "preve nt, rescue ea ch ot her, ensure safety and reduce losse s" principle, a ccordi ng to the l ocal conditi ons, make the management system. 1, t he pri nci pal is the re sponsibility of scho