a construction worker wearing a safety harness and hard hat with toolbox checks a large drainage pipe at a construction site. - 硬管 個照片及圖片檔建築地盤, 風險, 地底下
top view or aerial view of water treatment tank, water treatment production for purify water, drinking water production and distribution - 硬管 個照片及圖片檔污水處理廠, 能源, 鳥瞰
asian technician engineer maintenance drinking water pipe and pressure tank . - 硬管 個照片及圖片檔污水處理廠, 工程師, 工程技術
industrial view at oil and gas refinery plant for industry zone with and cloudy sky, steel pipeline with insulation, equipment, cables and piping as found inside of a industrial power plant - 硬管 個照片及圖片檔氣體, 原油, 工廠
industrial welder working on pipeline with tig welding torch in factory workshop - 硬管 個照片及圖片檔焊接工人, 焊接, 拱門 - 建築特色
sandblasting or abrasive blasting for steel pipes before painting and coating - 硬管 個照片及圖片檔工業, 金屬, 畫 - 活動
