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机械伤害的预防对策 | 2012-12-9 10:10:00
Re:机械伤害的预防对策 | 2012-12-9 10:11:36
章仁根机械[jīxiè]:1. [Machine;Machinery]∶利用力学原理构成的机构;2. [Mechanical;Rigidly;Inflexibly]∶比喻拘泥于成规,刻板而不知变通.
  机械(Machine),源自于希腊语之Mechine及拉丁文Mecina,原指“巧妙的设计”,作为一般性的机械概念,可以追溯到古罗马时期,主要是为了区别与手工工具。现代中文之“机械”一词为机构为英语之(Mechanism)和机器(Machine)的总称。机械的特征有:机械是一种人为的实物构件的组合。机械各部分之间具有确定的相对运动。机器具备机构的特征外,还必须具备第三个特征即能代替人类的劳动以完成有用的机械功或转换机械能,故机器能转换机械能或完成有用代机械原理中的最基本的概念,中文机械的现代概念多源自日语之“机械”一词,日本的机械饮用品对机械概念做如下定义(即符合下面三个特征称为机械Machine):
  1.机械是物体的组合,假定力加到其各个部分也难以变形。
  2.这些物体必须实现相互的、单一的、规定的运动。
  3.把施加的能量转变为最有用的形式,或转变为有效的机械功。
By:章仁根 | 个人主页 | 引用 | 返回 | 删除 | 回复
原创 | 2016-9-6 20:16:31
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By:原创(游客) | 个人主页 | 引用 | 返回 | 删除 | 回复
原创 | 2016-9-28 19:53:44
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原创 | 2016-9-30 14:34:09
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Re:在漫画中识别身边的违章 | 2016-10-6 0:09:24
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Re:在漫画中识别身边的违章 | 2016-10-8 19:26:08
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By:sijnr(游客) | 个人主页 | 引用 | 返回 | 删除 | 回复
Re:在漫画中识别身边的违章 | 2016-10-11 18:46:23
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Re:在漫画中识别身边的违章 | 2016-10-16 2:35:07
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By:crvzc(游客) | 个人主页 | 引用 | 返回 | 删除 | 回复
Re:在漫画中识别身边的违章 | 2016-10-16 16:07:05
tofad(游客)http://www.jxedt.com/wen/kaoshi/3170985519941353526.html
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Re:在漫画中识别身边的违章 | 2016-10-17 1:52:36
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Re:在漫画中识别身边的违章 | 2016-10-20 17:54:50
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Re:在漫画中识别身边的违章 | 2017-2-19 0:10:47
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Re:在漫画中识别身边的违章 | 2017-2-19 13:34:15
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By:ywlpt(游客) | 个人主页 | 引用 | 返回 | 删除 | 回复
Re:在漫画中识别身边的违章 | 2017-3-4 14:15:08
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