分类： 信息化
2014-03-29 15:40:11
The metal sheet is pressed from two different metal alloys combined together (with the alloy and the components are different according to the different temperature points). According to the principle of thermal expansion, and at the same temperature, the two metal pieces because of different intensity and deformation. Protrusions or concave. Then using a cylindrical lever of the switch can be controlled. to make your car more safe and secure.
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