In ultrasonic machining, the metal is removed by

1.	In ultrasonic machining, the metal is removed by
A.	Using abrasive slurry between the tool and work
B.	Direct contact of tool with the work
C.	Maintaining an electrolyte between the work and tool in a very small gap between the two
D.	Erosion caused by rapidly recurring spark discharges between the tool and work
Answer» B. Direct contact of tool with the work

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In ultrasonic machining, the metal is removed by

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