In or der to e nsure normal teaching orde r, protecti ng students ' healthy growth, ensuri ng that nati ona l (property) is not lost, t o preve nt or mi nimize the occurre nce of safety accidents, f ollow t he "prevent, rescue ea ch othe r, e nsure safety and reduce l osses" pri nciple, a ccording t o the local condit ions, make the ma nagement system. 1, the principal is the responsi bility o