<tt id="6hsgl"><pre id="6hsgl"><pre id="6hsgl"></pre></pre></tt>
          <nav id="6hsgl"><th id="6hsgl"></th></nav>
          国产免费网站看v片元遮挡,一亚洲一区二区中文字幕,波多野结衣一区二区免费视频,天天色综网,久久综合给合久久狠狠狠,男人的天堂av一二三区,午夜福利看片在线观看,亚洲中文字幕在线无码一区二区

          3D-printed 'ancient bridge' put to use in Tianjin

          By Zhang Yu in Shijiazhuang | chinadaily.com.cn | Updated: 2019-10-17 10:51
          Share
          Share - WeChat
          A 3D-printed concrete bridge at 1:2 scale of the Zhaozhou Bridge — the oldest standing bridge in China — was put into use at Beichen campus of Hebei University of Technology in Tianjin on Oct 13, 2019. [Photo by Tu Qiongfang/for chinadaily.com.cn]

          A 3D-printed concrete bridge has been completed and put into use at a university in North China's Tianjin municipality, and it is believed to have the longest span among its kind, according to Hebei University of Technology.

          The pedestrian bridge is a replica of Zhaozhou Bridge in Zhaoxian county in neighboring Hebei province, the oldest standing bridge in China.

          Built in the Sui Dynasty (581-618), it is also the world's oldest single-arch bridge, with a span of 37 meters according to Xinhua News Agency.

          1 2 3 4 5 Next   >>|
          Top
          BACK TO THE TOP
          English
          Copyright 1994 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
          License for publishing multimedia online 0108263

          Registration Number: 130349
          FOLLOW US
          主站蜘蛛池模板: 亚洲熟妇AV午夜无码不卡| 免费 黄 色 人成 视频 在 线| 国产精品人成在线观看免费| 人妻无码视频一区二区三区| 97免费人妻无码视频| 亚洲av日韩av永久无码电影| 性欧美在线| 亚洲国产色一区二区三区| 精品一区二区亚洲国产| 久9视频这里只有精品| 中文字幕第55页一区| 无码中文字幕av免费放| 国产精品第12页| 久久久喷潮一区二区三区| 久久这里都是精品二| 国产成人午夜福利精品| 欧美性猛交xxxx富婆| 成人av在线播放不卡| 韩国的无码av看免费大片在线 | 国产精品中文字幕av| 日本不卡三区| 中文字幕在线精品人妻| 久久久久久99av无码免费网站| 日本一区二区三区四区黄色| 2019亚洲午夜无码天堂| 国产精品鲁鲁鲁| 欧美zozo另类人禽交| 在线国产毛片| 亚洲精品三区四区成人少| 天天爽夜夜爱| 18岁日韩内射颜射午夜久久成人| 欧美人妻在线一区二区| 国产精品亚洲二区在线播放| 亚洲欧美精品中文第三| 成人国产av精品免费网| 清纯唯美人妻少妇第一页| 国产午精品午夜福利757视频播放| 人人爽人人爽人人片av东京热| 丰满人妻被猛烈进入无码| 狠狠色丁香婷婷亚洲综合| 在线国产极品尤物你懂的|