世代交替(alternation of generation)

1、The frequency of an alternator is cont

The frequency of an alternator is controlled from the main switchboard by adjusting the（）Afrequency meterBvoltage regulatorCgovernor controlDsychroscope switch

2、All of these alternatives are carbon-b

All of these alternatives are carbon-based fuels（）molecules are smaller and simpler than those of gasoline.AwhichBwhoCwhatDwhose

3、The operation of （） two alternators re

The operation of （） two alternators requires the voltages to be equal and also in phase.AparallelingBseries-mountingCrunningDcontrol

4、平均世代年数(mean longth of generation, LG)

平均世代年数(mean longth of generation, LG)

5、The alternating current generator supp

The alternating current generator supplying a load has a voltage drop resulted from the loadWhen the load has a lagging power factor this voltage drop （）.Ais smallBmay be neglectedCis usefulDis considerable

6、世代交替（alternation of generations）

世代交替（alternation of generations）