【判断题】发动机在实际工作过程中,为了减少进气阻力,进气门通常要提前打开
【简答题】By the time you get back, great changes __________in this area. A.will take place B. are taking place C. will have taken place D. are to take place
【简答题】来自总风缸的压力空气,经QY-15型调压阀减压至550Mpa后,贮存在容量为20L的控制风缸内。当电气阀的电气部分起作用时,控制风缸内的压力空气使经由空气管路和电空阀通往各()。
【单选题】Mobile phone is _____ used by many people _____ a communication tool. [ ]
【简答题】It is a language widely used in the world.
【判断题】YZ-1型空气制动机在控制单机运行时,用作单独制动阀的空气制动阀实施均衡风缸的压力控制,再通过分配阀均衡部去控制制动缸的压力变化,从而实现制动和缓解作用。
【单选题】In the past few years there _ great changes in my hometown. [ ]
【简答题】Why are abbreviations widely used in EST?
【简答题】如图所示为KBGM制动系统控制原理图。紧急制动时, 阀处于不励磁工况,滑动阀在右侧,接口A1和A3导通,从 缸接口R传来的压力空气绕过 阀直接进入 阀。该阀根据车辆负载输出最大预控制压力,进入 阀后使 缸的压力空气通过该开启的进气阀口和输出口C充入各单元制动机的 缸,产生紧急制动作用。
【简答题】Why could not ceramics be used widely in the past?