變更

（3）锉刀长度规格的选择取决于工件锉削面积的大小，加工面越大则锉刀的尺寸就越大。<ref>[http://mooc.chaoxing.com/nodedetailcontroller/visitnodedetail?knowledgeId=841544 锉削基本知识工具],超星慕课网</ref>

[[ File:543b4097a3107405aa2ca971.png|缩略图|左|450px|[http://mooc.chaoxing.com/nodedetailcontroller/visitnodedetail?knowledgeId=841544 来自超星慕课网]锉刀形状的选用]]