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节制闸标
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节制闸标
设在靠近节制闸上游或上、下游一侧的岸上,也可将灯悬挂于节制闸的上游或上、下游水面上空架空线上,标示前方是节制闸防止船舶误入发生危险的航行标识。
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crape myrtle screen in Dujiangyan Lidui Park
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crassulacean acid metabolism,CAM
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