单项选择题
A.Mill B.Float C.Warding D.Second cut
The tool used in precision work to smooth or enlarge a ...
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
Reheating a hardening component to a temperature lower ...
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
Which of the listed effects represents the purpose of h...
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
