LEED要求建筑物保持其认证等级，美国绿色建筑委员会将每五年进行一次复查。
LEED requires that buildings maintain their certification with subsequent USGBC inspections every five years.
污水处理厂的运营商要求具备污水收集和污水处理认证(根据工厂认证等级分为i, II, III或IV级)。
Certification in wastewater collection and wastewater treatment (level I, II, III or IV depending certification level of the plant) is required for wastewater treatment plant operators.
它提供三个等级，包括PM助理、项目经理和规划1管理中的认证。
It offers three levels, including PM associate, project manager, and a degree in program 1 management.
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