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EUPOⅡ既是用立法手段对发动机开发进行技大限制，同时又是对研究人员，开发人员和设计人员的挑战。EUPOⅡ中规定的气体和固体物排放的限值曾被人认为到1995／96年是几乎无法达到的，但有几个生产厂家最迟在1995年初在某几种发动机或全部发动机纲领方面将达到上述目标。达到后
EUPO II is both a legislative approach to engine development technology limitations, but also to researchers, developers and designers challenge. Emissions limits for emissions of gases and solids specified in EUPO II have been considered practically unachievable by 1995/96 but several manufacturers will reach some of the engines or all of the engine programs by early 1995 at the latest The above goal. After reaching