In order to ensure normal tea chi ng order, pr otecti ng students ' healthy gr owth, e nsuring that national (property) is not l ost, to prevent or minimize t he occurrence of safety accidents, foll ow the "prevent, re scue ea ch ot her, e nsur e safety and reduce l osses" principl e, accor ding to t he local conditi ons, make t he manageme nt system. 1, the pri nci pal is the responsibility of s