<strike id="gegfc"><dl id="gegfc"></dl></strike>
<sub id="gegfc"></sub>

    <mark id="gegfc"></mark>

      Learn the 'Codes' in Railway System by LEGO

      Source: Xinhua| 2019-09-20 15:52:55|Editor: huaxia
      Video PlayerClose

      SHUOZHOU, Sept. 20, 2019 (Xinhua) -- Flag semaphore, an ancient information-conveying system widely used in the maritime world, is also adopted in railway operation.

      Despite the progress of modern technology, flag semaphore still plays an important role in ensuring the safety of trains, due to complex working environment.

      A railway worker in Shanxi, north China, presents examples of flag semaphore in railway system, with LEGO bricks.

      KEY WORDS:
      EXPLORE XINHUANET
      010020070750000000000000011102121384077911
      中文字幕日韩无线码在线一区_制服肉丝亚洲中文字幕_日韩欧美无砖专区一中文字目_国产精品点击进入在线影院高清
      <strike id="gegfc"><dl id="gegfc"></dl></strike>
      <sub id="gegfc"></sub>
      
      
        <mark id="gegfc"></mark>
          色窝窝AV一区二区三区 | 一级a一片久久免费 | 欧美国产激情一区二区 | 精品在线一区二区日韩国产精品 | 伊人久久福利中文字幕 | 久久久夜夜嗨免费视频 |