礦井維修電工(高級技師)單項選擇題每日一練(2020.01.11)

A.2000
B.3000
C.4000
D.5000

A.改變電動機的極對數(shù)
B.改變轉(zhuǎn)差率
C.轉(zhuǎn)子電路串附加電勢
D.轉(zhuǎn)子電路串附加電阻

A.9U
B.3U
C.U
D.U/3

A.0.2%
B.0.5%
C.1%
D.1.5%

A.1
B.3
C.6
D.12