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The specific cutting energy used for establishing the machinability of the metal depends upon its

A. Coefficient of friction

B. Microstructure

C. Work hardening characteristics

D. All of these

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  20. A broach has
  21. The angle formed by the leading edge of the land with a plane having the axis of the drill, is called
  22. High speed steel drills can be operated at about _________ the speed of high carbon steel drills.
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