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yong hao shi wu jiao ju he gua tu
Author(s): 
Pages: 7+4
Year: Issue:  2
Journal: Farm Machinery

Keyword:  零件组成发动机体课堂效果教师语言相互位置密封胶圈液压系统连接螺栓主被动齿轮液压油泵;
Abstract: <正> 实物教具和挂图是讲好拖拉机课的重要手段。对实物教具和挂图运用得好,可以提高课堂效果,使学员理解快,印象深,掌握牢。对实物教具的要求 1.零件要全拖拉机是由很多零件组成的,而且各种零件的大小、形状、材质、重量和作用都是不相同的,是不能互相替换的。讲构造课缺少哪个零件都会感到困难,大至发动机体,小至气门锁瓣。如果缺
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