In or der to e nsure normal teaching orde r, prote cting students ' healthy growth, e nsuring t hat nati onal (pr operty) is not l ost, to prevent or minimize t he occurrence of safety acci dents, follow t he "preve nt, rescue ea ch othe r, e nsure safety and reduce l osses" pri nci ple, a ccording t o the l ocal conditi ons, make t he management system. 1, the principal i s the re sponsibil ity o