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髻籽羊齿科
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髻籽羊齿科
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古植物学
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髻籽羊齿科
种子植物的一科。种子具有双角,状似发髻,因此而得名。分类位置不明确。
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roof and floor of wood frame construction
roof-angle prism
roof fall
roof garden
roof greening
roofing beam
roofing engineering
roof iris
Roofloy
roof of coal seam
roof planting
roof prism
roof-ridge decorative animal sculptures
roof strata collapse of working face
Roof Tile With Monster-mask
Rooftop
roof top reflector
roof truss
roof turf
Rookie play prize
Rook number
Rook polynomial
rook polynomial
Rook reciprocity theorem
Rooks problem
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