A .  Is extensively used for making bolts and rivets
B .  Is used for reducing the diameters of round bars and a tube by rotating dies which open and close rapidly on the work
C .  Is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface
D .  Consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part
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