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
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相关考题
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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 -
单项选择题
Using a file without a handle may result in （）
A.your work becoming rounded
B.injury to your hand
C.overheating of the file
D.pinning
