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單項選擇題

Which of the listed types of files is the best for producing a fine finish on metal?（）

A.Mill
B.Float
C.Warding
D.Second cut

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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

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

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