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
最新試題
The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.
The treatment of the fuel oils involves storage, heating, filtering and（）
（） is not installed on the main switchboar.
Diesel engine air start system check valves are opened by （）
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）