[Solved] Machining rate can be affected by the ratio of hardness of tool to that of hardness of work piece.

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Q.	Machining rate can be affected by the ratio of hardness of tool to that of hardness of work piece.
A.	true
B.	false
Answer» A. true
Explanation: in usm, machining rate increases as the mentioned ratio decreases and vice-versa.

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