单项选择题
A.analogger B.bell logger C.alarm logger D.data logger
Which of the following types of motors is often designe...
单项选择题Which of the following types of motors is often designed for use in correcting power factor?（）
A.Polyphase B.Wound-rotor C.Induction D.Synchronous
Power transformers are rated in （）.A.kilowattsB.ampere-...
单项选择题Power transformers are rated in （）.
A.kilowatts B.ampere-turns C.kilowatt-volts D.kilovolt-amperes
The purpose of DC generator brushes is to （）.A.neutrali...
单项选择题The purpose of DC generator brushes is to （）.
A.neutralize armature reaction B.conduct electric current to an outside circuit C.convert DC current to AC current D.provide excitation to a DC generator
