人人爽人人爽人人片av免费,中文字幕乱伦,国产午夜福利伦理300,欧洲成人亚洲,亚洲福利网站,国内精品伊人久久久久7777,国产精品一级黄色片,国产精品综合久成人,久久成人18免费网站,亚洲无码偷拍,亚洲欧美日韩综合网导航

Contact shrapnel is a mechanical part that uses elasticity to work. Generally made of metal shrapnel steel. It is used to control the movement of parts, alleviate impact or vibration, store energy, measure the size of force, etc. It is widely used in machines and instruments. The types of hardware shrapnel are complex and diverse. According to the shape, they mainly include positive contact, power supply shrapnel, and contact mother shrapnel. Contact shrapnel belongs to the category of metal stamping parts and electronic hardware materials. It is made of stainless steel or manganese after heat treatment. It is an important part of the switch. With the help of the conductivity of the metal shrapnel, it can play a high-quality switch between the operator and the product. At the same time, using the stable resilience of the guozi (automatically return after pressing), and the long life, provide the operator with high-quality tactile feedback!