【单选题】
列车进入制动工况时，___优先施加。
A. 再生制动
B. 保压制动
C. 电阻制动
D. 常用制动
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答案
A
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【单选题】
BCU气路的主要功能是___。
A. 控制停放制动的施加
B. 控制停放制动的缓解
C. 形成并调整预控压力，实现对单元制动缸的充风
D. 形成并调整预控压力，实现对停放制动缸的充风
【单选题】
下面关于广播的说法错误的是___
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B. PIS系统主机提供OCC广播接口，当有OCC广播到来的时候，自动播放OCC广播。
C. 人工广播采用动圈对讲机麦克风，在讲话时需要按压PTT按键。
D. 人工广播可在非激活端司机室进行。
【单选题】
下面关于广播优先级（由高到低）的说法正确的是___
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D. 紧急广播>OCC广播>人工广播>报站广播
【多选题】
紧急制动不能缓解___。
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下列原因可能会导致弓网故障的是___。
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B. 接触网位移
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【多选题】
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【多选题】
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