题干

沈括《梦溪笔谈》载:“世间锻铁所谓钢铁者,用柔铁屈盘之,乃以生铁陷其间,泥封炼之,锻令相入,谓之团钢。”这项技术最早出现于(    )

A:春秋时期

B:西汉

C:南北朝

D:北宋

上一题 下一题 0.0难度 选择题 更新时间:2018-12-08 11:38:42

答案(点此获取答案解析)

C

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》)