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pipeline marker stake
管道标志桩
管道上方标识埋地管道与公路、铁路、河流、管道、光缆、电缆和地下构筑物等的交叉点,标识埋地管道附属设施、水工、地质灾害保护设施以及管道抢修作业点的地面标记。
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water level duration curve
water level fluctuation
water level forecasting
water level gauge
water level inscription in ancient China
water levelling in ancient China
water level observation
water level staff in ancient china
water level station
water lifting
water lifting cylinder wheel
water lifting irrigation
water lifting machinery in ancient China
water light pollution
water lily
water-lily family
waterline
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water-logged compost
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