其次，在此基础上，提出了液化石油气城市客车的道路试验方案，并进行了改造车辆的道路试验研究分析。
Secondly, on this basis, have proposed the road testing program of the urban passenger train of liquefied petroleum gas, research and analyse the road test of transforming the vehicle.
其次，在此基础上，提出了液化石油气城市客车的道路试验方案，并进行了改造车辆的道路试验研究分析。
Secondly, on this basis, have proposed the road testing program of the urban passenger train of liquefied petroleum gas, research and analyse the road test of transforming the vehicle.
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