【单选题】
半自动缓解阀与（ ）接触不严密者，易造成漏风，须研磨加修。(1.0分)
A. 阀杆
B. 阀座
C. 阀芯
D. 弹片
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答案
B
解析
暂无解析
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DK-1型制动机无动力回送时，其109型分配阀上的安全阀压力应调整至（ ）。(1.0分)
A. 50～100 kPa
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D. 试验台试验、单机试验、列车试验
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【单选题】
120紧急阀阀微控试验台安定性能试验中，列车管减压( )后关断“F”，紧急室压力应跟随列车管压力下降，并不得发生紧急放风作用。(1.0分)
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JZ-7型空气制动机自动制动阀手柄在制动区，均衡风缸减压过快的原因有可能是（ ）。(1.0分)
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