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螺旋烃
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螺旋烃
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螺旋烃
邻位稠合的多环芳烃化合物,其中苯环或其他芳烃呈角环化,形成螺旋形手性分子。曾称螺烯。
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river and lake shoreline planning
River and Mountain Scenery in Autumn
river and ocean combined transportation
river aquaculture
river bank
river bank collapse
river basin
river basins in China
river bed
river bed armoring
riverbed deformation
riverbed intake structure
riverbed with heterogeneous habitat structure
river biota
river bottom tunnel
river branching parameter
river canalization
river capture
river cascade hydropower development
river channel bed
river channel bed form
river channel self-adjustment
river channel strengthening engineering
river chart
river closure
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