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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To anneal a copper gasket, you should heat the gasket（）
A.and quench it in oil
B.cherry red and quench in water
C.and let it cool slowly in the air
D.and carbonize -
单项选择题
A drilled hole is accurately finished to size with a （）
A.center drill
B.finish drill
C.broach
D.reamer -
单项选择题
Which of the files listed is tapered on three sides and is used to file acute internal angles?（）
A.Mill
B.Round
C.Square
D.Triangular
