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
    主站蜘蛛池模板: 五福影院最新地址| 午夜香港三级在线观看网| 99久久久精品免费观看国产| 日本午夜理伦三级在线观看| 亚洲欧美性另类春色| 一级毛片在线播放免费| 狼人总合狼人综合| 国产羞羞视频在线观看| 久久99九九国产免费看小说| 精品三级在线观看| 国产成人午夜高潮毛片| 中文丰满岳乱妇在线观看| 福利一区二区在线| 国产精品日本一区二区在线看| 亚洲AV色香蕉一区二区| 狍和女人一级毛片免费的| 国产三级精品三级在线观看| 网址在线观看你懂的| 天天躁日日躁狠狠躁日日躁 | 99国产欧美久久久精品蜜芽| 校园放荡三个女同学| 伊人久久久大香线蕉综合直播| 亚洲五月丁香综合视频| 天天夜天干天天爽| 久艹视频在线免费观看| 精品视频一区在线观看| 在线免费视频一区二区| 久久婷婷激情综合色综合俺也去| 欧美日韩视频一区三区二区| 国产人妖cd网站| 99热精品国产三级在线观看| 成年女性特黄午夜视频免费看| 亚洲AV无码国产一区二区三区| 毛片网站是多少| 国产亚洲av片在线观看18女人| 老司机久久精品| 国内精品久久久久国产盗摄| 久久99精品久久久久久齐齐 | 国产好爽…又高潮了毛片| 一级特色大黄美女播放网站| 日韩一区二区在线免费观看|