Barter is the present and the future of international trade, especially for people who is starting in the import export business. Barter and more: Triangular operations.
Classification of mouse Rolling ball mouse: The rubber ball is driven to the grating wheel with the crystal pulse signal sensor of the light-emitting diode and the phototransistor. Optical mouse: light source pulse signal sensor with light-emitting semiconductor…
Common classification of keyboards There are two types of conventional keyboards: mechanical keys and capacitive keys. In the industrial computer keyboard, there is also a keyboard with a light touch membrane key. The mechanical keyboard is the earliest…
Classification of keyboards 1. Mechanical keyboards use similar metal contact switches. The working principle is to make the contacts turn on or off. It has the characteristics of simple process, high noise, easy maintenance, strong sense of rhythm when…
Classification and characteristics of hats 1. Bucket hat The fisherman hat is a very popular hat style in recent years. It is called the fisherman hat because this hat is modified from the hats worn by fishermen who fish by the sea. This kind of hat…
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