【題目】建設(shè)部、化工部等有關(guān)部門規(guī)定,新建小區(qū)的戶外排水管必須使用塑料管,不要使用傳統(tǒng)的鑄鐵排水管。國家推廣使用塑料建材的主要目的是(

A.保護(hù)金屬資源

B.金屬易腐蝕,塑料管使用的時間長

C.降低建筑成本

D.塑料的密度小,減少建筑的自身重量要實(shí)現(xiàn)無污染排放

【答案】A

【解析】

試題分析:金屬資源是有限的,不可再生的,保護(hù)金屬資源的措施之一是尋找金屬的替代品,因此,A正確;B、C、D三項原理上都正確,但不是主要目的。故選A

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