单项选择题
Equal power factors on paralleled AC generators are maintained by an automatic （）.
A.voltage regulator B.reverse power relay C.reverse current relay D.governor control switch
单项选择题 To equalize the power factor of two alternators operating in parallel, the （）
单项选择题 An advantage of DC motors over AC motors is that they （）
单项选择题 Which of the following devices are protected from being motorized by a reverse-power relay?（）
