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check dam
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水土保持工程措施
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check dam
谷坊
修建于山区沟道中用于拦截泥沙、固定沟床的低于5米的拦挡建筑物。又称闸山沟、沙土坝、垒坝阶。是水土流失地区沟道治理的一项主要工程措施。
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Universal Negro Improvement Association and African Communities League
universalness
universal normal algorithm
universal object
universal optical measurement instruments
universal pair
universal parabolic constant
universal PCR
universal periodic orbit sequence
Universal Pictures Co.
universal polar stereographic projection
universal polynomial
Universal Postal Congress
universal postal service
Universal Postal Union
universal predicate
universal principal bundle
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universal product code
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universal profinite group
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