单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
