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 shipboard oil pollution emergency plan will be invalid after （）
Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
Which of the following items don’t belong to dock repair works?（）
“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a（）
Engine parameters shall be corresponded to NOx Technical Files. This is required by （）
Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）
Cold weather starting of a diesel engine may be made easier by（）
During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）
Under MARPOL Code the ship to which it applies has to carry （）