常见例句Appreciate the pastoral area protogenesis best quality mastiff. 首页>>搞笑贴图>>欣赏牧区原生极品獒。The invention refers to an extraction method of zinc, lead in protogenesis lead and zinc sulphide. 本发明涉及原生铅锌硫化矿中锌、铅的浸出方法。 返回 protogenesis