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本文对上海市机动车、助动车排染情况和发动机排放法规情况作了简要介绍，讨论了LPG（液化石油气）车用发动机的性能和有利于环保的措施．文中主要数据均取自于实测结果．
In this paper, the situation of vehicle emission and vehicle emission in Shanghai and the regulations on engine emission are briefly introduced. The performance of LPG (liquefied petroleum gas) engine and the measures beneficial to environment protection are discussed. The main data are taken from the measured results.