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【单选题】
在空调系统工作中，发生自动关断并已判明是由于压气机出口处空气超温引起的，则发生此故障的可能原因是A.
一级散热器内部通道堵塞
B.
一级散热器外部冷却气流通道堵塞
C.
二级散热器散热效果差
D.
温度控制活门卡滞在
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