久久久久免费视频,久久婷婷激情综合色综合,亚洲精品一区二区在线观看,精品高潮黄又色高清视频免费,日本精品三级一区二区,久久久99精品国产一区二区三区,国产一区二区色淫影院,天天日天天干夜夜操,亚洲精品久久国产玖玖亚洲,精品一区二区三区四区在线播放

On July 21, 2021, the "Zhiyuan" intelligent CSD designed by Shanghai Hansail  for the national engineering reserch center dredging was successfully launched in Shanghai Caozhen Shipyard, Hansail General Manager Sun Qingsong and Chief Engineer Shao Min attended the launching ceremony.

The total length of the Zhiyuan is about 29.9m, the width is 7.3m, the diameter of the suction and discharge pipe is 300mm, and the maximum dredging depth is 6m. Its main working mode is unmanned operation in the ship's cab, remote remote dredging operations at the shore end, fully automatic control function of "one-key dredging", and operation in inland river B-level navigation areas.