Cooling makes the engine metals their mechanical properties.
A.Remain
B.to remain
C.retain
D.to retain
第1题
A.The alternators are not generating the same voltages and should be adjusted on automatic voltage regulator rheostats
B.Alternator frequencies are different and should be adjusted on the governor speed controllers
C.Alternators are out of phase and should be tripped and paralleled again
D.One alternator has lost one of its phases
第2题
A.discharge service valve as a vapor
B.suction service valve as a liquid
C.charging valve as a liquid
D.condenser purge valve as a vapor
第3题
A.help preheat the air for the furnaces
B.help preheat the feedwater
C.protect economizer from excessive heat
D.prevent excessive furnace heat losses
第4题
A.instantaneous voltage
B.average voltage
C.RMS voltage
D.peak voltage
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