?三孔磁心
... core recovery of drilling hole 钻孔岩心采取率 full-hole core 全直径岩心 three hole core 三孔磁心 ...
三孔铁心
Our own galaxy, the Milky Way, has a colossal black hole at its core, too, which is some three million times the mass of our Sun.
BBC: NEWS | Science/Nature | Deepest X-rays tell merger story
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