A.higher than that of copper
B.lower than that of copper
C.equal to that of copper
D.reached when the conductor it is protecting becomes "white hot"
您可能感興趣的試卷
你可能感興趣的試題
A.low voltage battery
B.motor attenuator set
C.DC exciter generator
D.AC supply
A.replace all bearings regardless of length of service
B.apply a heavy coat of oil to all mating surfaces
C.clean any corroded surfaces and file all burrs smooth
D.coat all parts with alemite grease
A.Peak value
B.Root-mean-square value
C.Average value
D.Maximum value
A.time-delay protection
B.short-circuit protection
C.short duration surge protection
D.sustained overload protection
A.a magnetic operating coil
B.normally open line contacts
C.thermal-overload protection
D.a momentary-contact start button
最新試題
During the diesel engine running, the water level of F.W expansion tank should normally kept in the () level of glass tube.
“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a()
To proceed to the assistance of a ship in distress is()
If two A.C.generators are to be operated in parallel, the load is distributed evenly by()
The condensers located in various stages of a flash evaporator are cooled by()
Using a file without a handle may result in ()
The shipboard oil pollution emergency plan will be invalid after ()
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.
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to ()
The treatment of the fuel oils involves storage, heating, filtering and()