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中外著名科学家的故事--张衡

ebook
张衡是我国古代伟大的天文学家,他出生于公元78 年。关于他的家世,还得从西汉末年中原的南阳郡(现河南洛阳南面)说起。

Formats

  • OverDrive Read
  • PDF ebook

Languages

  • Chinese