What type of rotor is used in split-phase motors?（）

A.load limit settings
B.idle speed settings
C.speed limit settings
D.speed droop settings

A.collect all available data on a casualty
B.recognize normal operation
C.identify the probable cause of a symptom
D.isolate the faulty component

A.magnetic amplifier
B.ship’s service alternator
C.three-wire DC generator
D.saturable core reactor