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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A.center drill
B.finish drill
C.broach
D.reamer
A.Mill
B.Round
C.Square
D.Triangular
A.your work becoming rounded
B.injury to your hand
C.overheating of the file
D.pinning
A.safe for becoming rounded
B.safe for hot work
C.not safe for personnel
D.not safe for hot work
A.checking the area for items that may catch fire
B.that a fire watch be posted
C.checking for the explosive gases
D.all of the above
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Flame failure in an automatically fired auxiliary boiler can from a/an （）
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As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）
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