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已购公用住房和经济适用住房的土地权利性质基本上为()。
制作多媒体CAI课件时,除了计算机,还要根据需要准备一些外围设备,下列中哪一件设备不是制作课件必须设备:()
1972年,埃德加·富尔在()一书中确定了“终身教育”思想,并提出未来社会是“学习化社会”。
培养基
铺设地毯的房间,踢脚板下口应高于地面()mm左右。
阐述食物链在生态系统的能量流动中所起的作用。
罗茨风机运转前将进、出口管道中的阀全部打开。
饮水与疾病的关系非常密切。当饮用水受到细菌.病毒.原虫等生物性污染时,可引起介水传染病,若受到汞.铬.铅等有毒化学物的污染时,可导致急.慢性及潜在性的危害。介水传染病的流行特点有()。
( )是由动水力引起的土体失稳破坏的形式。
混凝土和砂浆用再生细骨料由建筑废物中的混凝土、砂浆、石、砖瓦等加工而成,用于配制混凝土和砂浆的粒径不大于2.36mm的颗粒。
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