A.Peak value
B.Root-mean-square value
C.Average value
D.Maximum value
您可能感興趣的試卷
你可能感興趣的試題
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
A.60
B.120
C.180
D.360
A.copper and antimony
B.steel and babbitt
C.aluminum or beryllium alloy
D.zinc or an alloy of tin and lead
A.prevent grounds in branch circuits
B.prevent opens in motor circuits
C.permit momentary overloads without melting
D.guard lighting and electronic circuits
最新試題
Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the()
The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the()
If separating effect is not good, which measure should be taken ()
Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?()
()are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
The main purpose of port State control is not to()
The treatment of the fuel oils involves storage, heating, filtering and()
Diesel engine air start system check valves are opened by ()
For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?()
As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?()