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Which parts are included in the abstract of a scientific paper?查看解析
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（翻译）Force F is a vector. The characteristics of a force are its magnitude, its direction, and its point of application 。查看解析
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（翻译）When heat is generated by plastic deformation or due to friction, the heat should be conducted away at a rate high enough to prevent a severe rise in temperature. The main difficulty experienced in machining titanium, for example, is caused by its very low thermal conductivity. Low thermal conductivity can also result in high thermal gradients and, in this way, cause inhomogeneous deformation of workpiece in metalworking processes. 查看解析
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（翻译）Milling machines. These are among the most versatile and useful machine tools because they are capable of performing a variety of cutting operations. There is a large selection of milling machines available with numerous features. 查看解析
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（翻译）车床的基本部件有：床身、主轴箱部件、尾架部件、溜板部件、丝杠和光杠。查看解析
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