二级减速器(机械设计基础课程设计)(完整版)
http://wenku.baidu.com/link?url=fxkPEp6l_BKxD1lQERvx3OHnTxGv12TB1DKA1lchkwcUcmjjx7m5XlVtn7n0T7wtILH4oeQ1qbLfhVSMy2MHG5R22uX_aslFVQTVU1AjVn_
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