自动呼叫和应答设备
automatic calling and answering unit
机动车排气污染
Vehicle exhaust pollution
机动车排放因子
Motor vehicle emission factors
机动车流路段阻抗函数
road traffic impedance function
机动车流量控制
urban vehicle control implementation
机动车临界流量值
cittical flow value of vehic1es
机动车排放标准
vehicle emission standards