evaluation of scientific devel opme nt. Nature security type --nature se curity is to mainte nance people of health value for target, t hrough stre ngthe ning security ba sed ma nagement, and risk management, a nd equipment ma nagement a nd technol ogy supervi sion, e nsure pr oduction i n the people, a nd real , and system, a nd system, eleme nts security r eliable , and harm ony unified, full