问题
单项选择题
现压阀的作用是（）。
A.当前、后制动管路压力由0同步增长到一定值后，即自动将前制动管路压力限定在该值不变
B.当前、后制动管路压力由0同步增长到一定值后，即自动将后制动管路压力限定在该值不变
C.当前、后制动管路压力由0同步增长到一定值后，即自动将前、后制动管路压力限定在该值不变
答案
参考答案：B
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现压阀的作用是（）。
A.当前、后制动管路压力由0同步增长到一定值后，即自动将前制动管路压力限定在该值不变
B.当前、后制动管路压力由0同步增长到一定值后，即自动将后制动管路压力限定在该值不变
C.当前、后制动管路压力由0同步增长到一定值后，即自动将前、后制动管路压力限定在该值不变
参考答案：B
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