Blues tone is also known as blue limestone. Blue stone by the mason from the mountains cut into a plate after widely used in the living room table table, or cabinet counter. Compared with natural marble, the advantage of bluestone lies in the main compone
Single-phase transformer a device that uses the principle of electromagnetic induction to change AC voltage. Its main components are primary coil, secondary coil and iron core (magnetic core). It is suitable for application and popularization in low-volt
