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trench engineering technology
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trench engineering technology
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沟洫工程技术
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trench engineering technology
沟洫工程技术
关于中国夏商周时期灌溉、排水渠系的记录与总结研究。沟洫系统肇始于夏,发展于商,至周代趋于规范化,在实施井田制的地区逐渐形成纵横交错的农田沟洫体系。
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α recursively enumerable set
α-recursively enumerable set
α recursive set
α-recursive set
α reduction
α-reduction
α relaxation
α resolvable design
α-resolvable design
α-rhombohedral boron
α-risk
α-santalane
α-sequence
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α-source
α spectroscope
α spectroscopy
α-spectroscopy
α-spectrum
α-string
α-superharmonic function
α-terpinene
α-test
α titanium alloy
α-trimmed mean
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