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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(轮机专业) > 轮机英语 > 船舶电气与船舶安全

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

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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

单项选择题

Which of the following nondestructive testing methods can be used to detect a suspected subsurface defect in a tail-shaft liner?（）

A.Dye penetrant
B.Magnetic particle
C.Ultrasonic
D.All of the above

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