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Найдите participle ii в следующих предложениях и определите их функции; предложения переведите: 1 the engineering plastics are now challenging the domain traditionally held by metals: truly load-bearing, structural parts. 2 the products produced by our chemical plant are of very high quality. 3 there are two kinds of materials used in engineering - metals and non-metals. 4 when added to steel certain elements can improve its properties.

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No, i'm not piking the flowers  at the  moment. yes,i  am.

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