在一个转速、电流双闭环V-M系统中,转速调节器ASR、电流调节器ACR均采用PI调节器。
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According to the author, a teacher should NOT_.
A. explain how policemen protect the pupils
B. have bias towards everything she/he wants to tell pupils
C. develop proper attitudes through science matters
D. attempt to change pupils' attitudes
试从下述各方面来比较双闭环系统和带电流截止环节的单闭环系统:
A. shifts B. switches C. sections D. classe
A. shifts
B. switches
C. sections
D. classes
证券市场走向集中化的重要标志之一是()的诞生。
A. 无形市场
B. 有形市场
C. 基金市场
D. 衍生产品市场