The development of the methods not only make sure that the urban vegetable product pollution control system is valid, exact and scientific, but also provide a sort of double secure affirmance for the urban vegetable product pollution control system.

• 该套方法的提出确保了城市蔬菜品种污染监控系统的正确性、准确性和科学性，为污染监控系统提供了“双保险”。