Article 14 of 1 10 Working Rules for Receiving and Handling Police stipulates: "1 10 alarm service desk accepts the following alarms: (1) criminal cases; (2) Public security cases (incidents); (3) Mass incidents that endanger personal and property safety or social order; (4) Natural disasters and public security disasters and accidents; (5) Other alarms related to illegal crimes that need to be handled by public security organs. " Article 29 stipulates: "1 10 The scope of receiving help from the alarm service desk includes: (1) drowning, falling off a building, suicide, etc. Need emergency assistance from public security organs; (two) the elderly, children, mentally retarded people, mental patients and other people are lost and need the help of the public security organs to find them in a certain range; (three) the public is in a dangerous and isolated state and needs immediate assistance; (four) involving water, electricity, gas, heat and other public facilities in danger, threatening public safety, personal or property safety and the order of work, study and life, requiring the public security organs to deal with it first; (5) Other urgent matters for help that need to be handled by the public security organs. " Items A and D belong to the scope of alarm, while items B and C belong to the scope of help, so item AD is selected.