Chrome，
QQ浏览器
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![人教数学九下29.1.2正投影[关老师]【市一等奖】优质课](//imgshow.1ydt.com/img?url=%2F%2Fi1.hdslb.com%2Fbfs%2Farchive%2F0cc989761d5a655bb06ca4232b874cfa407ff19c.jpg%40672w_378h_1c_%21web-search-common-cover)
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播放：4 时间：2025-11-23简介： -
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![人教数学九下29.1.2正投影[关老师]【市一等奖】优质课](http://imgshow.1ydt.com/img?url=%2F%2Fi1.hdslb.com%2Fbfs%2Farchive%2F0cc989761d5a655bb06ca4232b874cfa407ff19c.jpg%40672w_378h_1c_%21web-search-common-cover)
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