An advantage of DC motors over AC motors is that they （）<br>A:are less expensive<br>B:require less maintenance<br>C:can be started across the line<br>D:offer a more effective means of controlling speed

An advantage of DC motors over AC motors is that they （）
A:are less expensive
B:require less maintenance
C:can be started across the line
D:offer a more effective means of controlling speed

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