题目：
电动机正常运行时电压允许波动范围为额定电压的（）。
A、–5%～+10%
B、+15%
C、±10%
D、±5%
答案：
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参考答案：错
电动机正常运行时电压允许波动范围为额定电压的（）。A、–5%～+10% B、+15%
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