“Purbeckian”的概念、定义、翻译、参考文献-科学参考

单词	Purbeckian
释义	Purbeckian [pǝr`bek·ē·ǝn] ^GEOLOGY A stage of geologic time in Great Britain: uppermost Jurassic (above Bononian, below Cretaceous).
随便看	cementation sinking cement bond cement-bond survey cement brick cement carrier cement channeling cement copper cemented carbide cemented lens cement gland cement gravel cement gun cementing basket cement injector cementite cementitious material cement kiln cement-lined casing cement log cement mill cement mortar cement paint cement paste cement plaster cement pump

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