为提高城市的空气质量,应采取的措施有哪些?
(1)____________________________ ;
(2)______________________________________ ;
(3)______________________________ ;
(4)_______________________________________;
(5)______________________________________ 。
为提高城市的空气质量,应采取的措施有哪些?
(1)____________________________ ;
(2)______________________________________ ;
(3)______________________________ ;
(4)_______________________________________;
(5)______________________________________ 。