熟女丰满老熟女熟妇_91亚洲一线产区二线产区_香蕉视频污视频_蜜臀久久99精品久久久久久_免费观看污网站_精品人伦一区二区三电影_久久久午夜精品福利内容_国产真实乱人偷精品人妻_欧美日韩人妻精品一区在线_人妻激情偷乱视频一区二区三区

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!