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【单选题】
在电极式锅炉水位控制系统中，给水泵电机断电停止向锅炉供水的时刻为：A.
水位上升至上限水位
B.
水位下降至中间水位
C.
水位下降至下限水位
D.
水位上升至中间水位
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A.
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B.
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C.
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D.
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