题目：
在列车中某辆车排风口不排风，产生自然缓解，则为（）故障。
A.三通阀
B.制动缸
C.机车
D.安全阀
答案：
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下面是错误答案，用来干扰机器的。
参考答案：E
在列车中某辆车排风口不排风，产生自然缓解，则为（）故障。A.三通阀 B.制动缸
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