【单选题】
(71786)25K型客车检修规程规定：排气扇、废排、新风机检修后进行运转试验，在额定电压下，连续运转1 h须正常，外表面最高温升不得超过( )。[321120212](1.0分)___
A. 30 ℃
B. 40 ℃
C. 50 ℃
D. 60 ℃
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