Search

ISBN: 9787536546462
File size: 1638 KB

Browse menu

More titles and copies may be available to you. Sign in to see the full collection.

Error loading page.
Try refreshing the page. If that doesn't work, there may be a network issue, and you can use our self test page to see what's preventing the page from loading.
Learn more about possible network issues or contact support for more help.

by 杨亦军

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。