The constant speed drive section converts the ______ to ______ to make constant frequency electrical power。
A.variable speed ,constant speed
B.speed engine, constant speed
C.constant speed, variable speed
D.variable speed, speed drive
正确答案是A
The constant speed drive section converts the ______ to ______ to make constant frequency electrical power。
A.variable speed ,constant speed
B.speed engine, constant speed
C.constant speed, variable speed
D.variable speed, speed drive
正确答案是A