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【题目】建设部、化工部等有关部门规定,新建小区的户外排水管必须使用塑料管,不要使用传统的铸铁排水管。国家推广使用塑料建材的主要目的是(

A.保护金属资源

B.金属易腐蚀,塑料管使用的时间长

C.降低建筑成本

D.塑料的密度小,减少建筑的自身重量要实现无污染排放

【答案】A

【解析】

试题分析:金属资源是有限的,不可再生的,保护金属资源的措施之一是寻找金属的替代品,因此,A正确;B、C、D三项原理上都正确,但不是主要目的。故选A

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