There are two main types of turntables: belt drive and direct drive. All of the models we tested for this guide are belt drive, which means there’s a thin belt that connects the platter to the motor to make the thing spin. Direct drive turntables are widely used by DJs and Technics was the first to make them. Here, the motor is directly under the platter and connected to it directly so the setup is less prone to wearing out. This is especially key when you’re doing things like scratching. Direct-drive turntables tend to be more expensive than their belt-driven counterparts.
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Силовые структуры
both derivatives and intersection/complement operators originally came from a 1964 paper by Janusz Brzozowski (below).，详情可参考哔哩哔哩