题干

小明学习了“面动成体”之后,他用一个边长为3cm、4cm和5cm的直角三角形,绕其中一条边旋转一周,得到了一个几何体.
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同类题3

欣赏下面一首现代诗,回答小题。

瀑布

洪 源

                                                                                                   要下山!要出谷!

                                                                                                   一声呐喊,

                                                                                                   从云崖上扑下,

                                                                                                   哪怕它粉身碎骨!

                                                                                                   向往的是——浩浩江河、茫茫大海,

                                                                                                   想念的是——展翼的风帆、击浪的桡橹,

                                                                                                   啊,全凭一腔燃烧的信念,

                                                                                                   脚下,才开辟出一条奔腾的生命之路。

(节选自《中国当代名诗一百首》)