Behaviour being used: Deferred feedback

Minimum fraction: 0

Maximum fraction: 1

Question variant: 1

Question summary: 目前我国实施的尾气排放标准是借鉴哪个国家（ ）。: 日本; 韩国; 欧洲国家; 美国

Right answer summary: 欧洲国家

Response summary:

Question state: todo