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Aptychus

无褶

1、[古生]口盖

... apsidospondylous 弓状脊椎 aptychus 口盖 Aquilapollenites 鹰粉属 ...

2、复口盖

...风口盖 stock cap; tuyere cap复口盖 aptychus管口盖 o blank flange(blind flange); o blind flange (blank flange) ...

aptychus limestone菊石口盖灰岩

生物学

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