题目内容
(请给出正确答案)
[单选题]
Brushless generators are designed to operate without the use of__()
A.brushes
B.slip rings
C.commutators
D.all of brushes, slip rings and commutators
答案
D、all of brushes, slip rings and commutators
A.brushes
B.slip rings
C.commutators
D.all of brushes, slip rings and commutators
D、all of brushes, slip rings and commutators
第1题
A.the distribution box
B.the main switchboard
C.the section board
D.the emergency switchboard