A.Dye penetrant
B.Magnetic particle
C.Ultrasonic
D.All of the above
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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.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
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When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish
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