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水运工程 超声波水位计
Water transport engineering -- Acoustic water level gauge
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水运工程 地下水位计
Water transport engineering -- Groundwater stage gauge
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水运工程.旋桨式流速仪
Water transport engineering.Propeller-type current meter
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水运工程.超声波流速仪
Water transport engineering.Acoustic current meter
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踏步
Manhole steps
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土方机械 操作用仪表
Earth-moving machinery—Operating instrumentation
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钢框竹胶合板模板
Plybamboo form with steel frame
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螺栓球节点钢网架焊缝 超声波探伤及质量分级法
Methods for ultrasonic testing and classification of welds for steel space grid structures with bolted joints
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焊接球节点钢网架焊缝 超声波探伤及质量分级法
Methods for ultrasonic testing and classification of welds for steel space grid structures with welded joints
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