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- 3函数f(x)=5x+20x2(x>0)的最小值为( ) A.10 B.15 C.20 D.25
- 4大树吸进二氧化碳,吐出氧气为什么称第一本领这样写有什么好处
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- 7怎么背元素周期表?前20个
- 8鸟的天堂 中,最后一段有两个“鸟的天堂”,第一个是指(),第二个是指().
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