单项选择题
A.Dye penetrant B.Magnetic particle C.Ultrasonic D.All of the above
To anneal a copper gasket, you should heat the gasket（）...
单项选择题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
A drilled hole is accurately finished to size with a （）...
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
Which of the files listed is tapered on three sides and...
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
