Magnesite,talc and graphite mainly occur inthe Early and Middle Proterozoic basement rocks of the North China platform,Yantze platformand Jiamusi block.是什么意思_Magnesite,talc and graphite mainly occur inthe Early and Middle Proterozoic basement rocks of the North China platform,Yantze platformand Jiamusi block.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句