问题：
[单选题]一台四极三相电动机，电源频率为50Hz，带负载运行时的转差率为0.03，那么同步转速为（ ），实际转速为（ ）。
A、700r/min；700r/min
B、700r/min；727r/min
C、750r/min；727r/min
D、750r/min；700r/min
参考答案：
C
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