Ma ʻAukake 20, 2020, ua hana ke keʻena ʻoihana metro ʻo Guangzhou, ʻo Guangzhou Metro Design and Research Institute, me Nanjing Junli Technology Co., Ltd., i kahi hoʻomaʻamaʻa hoʻomaʻamaʻa wai kūpono o ka puka wai wai hydrodynamic piha ma ka puka / puka o ka Haizhu Square. Kūlana. Ua hoʻopaʻa maikaʻi ka ʻīpuka wai wai hydraulic hydraulic, a ua kūleʻa ka drill a mahalo nui ʻia.
Ka manawa hoʻouna: Sep-08-2020