A、are less expensive
B、require less maintenance
C、can be started across the line
D、offer a more effective means of controlling speed
更多“An advantage of DC motors over AC motors is that they （）”相关的问题
A、take the adv
A、the benefits
A、lack
A、lack
A、lack
A、Electrically non-conductive B、Relatively inexpensive C、Effective against chemicals containing
A、Higher administrative complexity B、Increased level
A、Smaller initial investment B、Doubles memory requirements C、Higher simult
A、greater r
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