A.low temperature hardening
B.case hardening
C.annealing
D.tempering
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A.Develop ductility
B.Improve machining qualities
C.Relieves stresses
D.All of the above
A.Dye penetrant
B.Magnetic particle
C.Ultrasonic
D.All of the above
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
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Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
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To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）
Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）
Using a file without a handle may result in （）
The shipboard oil pollution emergency plan will be invalid after （）