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單項選擇題

The tool used in precision work to smooth or enlarge a slightly undersized hole, is called（）

A.round out
B.round file
C.reamer
D.hole driller

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單項選擇題

Reheating a hardening component to a temperature lower than the hardening temperature and then cooling it is known as （）

A.low temperature hardening
B.case hardening
C.annealing
D.tempering

單項選擇題

Which of the listed effects represents the purpose of heat treating steel?（）

A.Develop ductility
B.Improve machining qualities
C.Relieves stresses
D.All of the above

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