Photograph by Kaido Haagen, A gray seal pokes its head through "clouds" of plant life in a winning picture by Estonian photographer Kaido Haagen.
爱沙尼亚摄影师KaidoHaagen拍摄的一只灰白色海豹从水底植物"云朵"中探头照片获得最佳图片。
The reason why gray castiron bridge pipeline with ammonia seal was quickly corroded was discussed and the countermeasure was suggested.
探讨了焦炉氨水自封槽结构灰铸铁桥管快速腐蚀的原因，提出了相应的处理对策。
The reason why gray castiron bridge pipeline with ammonia seal was quickly corroded was discussed and the countermeasure was suggested.
探讨了焦炉氨水自封槽结构灰铸铁桥管快速腐蚀的原因，提出了相应的处理对策。
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