有一个小数,它和0.7的整数部分相同,和3.9的小数部分相同,这个小数是( )。
0.9
辨析:任何哲学都是自己时代的精神上的精华,都是科学的世界观和方法论。
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常见的难加工金属材料有:高锰钢、高强度钢、不锈钢、高温合金、钛合金等。