DDW mining record

1. "Three Preventions" means Three Preventions and protections. In the electronic instry, "Three Preventions" generally refer to "mould proof, moisture proof and salt fog proof" for electronic procts. In a broad sense, surface treatment is used to rece or eliminate the adverse effects of complex environment on the performance of electronic devices. The process that the manufacturers of electronic procts brush three proofing paint on the circuit board after proction and debugging is called "three proofing". The definition of "three proofs" mobile phone is very simple, that is, it has the functions of slight stproof, shockproof and waterproof, so it has always been loved by young users who love outdoor sports. The basic human prevention is to use people's own sensors (eyes, hands, ears, etc.) to detect and respond to the targets that hinder or destroy safety; We should delay or prevent the occurrence of danger by means of sound warning, intimidation, setting up barriers, weapons and so on. When our own strength is insufficient, we should send out signals for help, in order to expect to make further response and stop the occurrence of danger or deal with the danger that has occurred.