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最佳答案：变焦系统在函数投影类型的正射投影仪中得到了广泛的应用.本文分析了二元变焦核的特性,讨论了应用于正射投影仪的变焦系统的设计思想,并且给出了具有二个变焦系统的设计实
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最佳答案：There were more than three thousands of volunteers joining in the planting of tr
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最佳答案：这话怎么说呢翻译过来翻译在好肯定和原文有不一样的地方,除非你在美国生活过几年
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最佳答案：The ancient Egyptian food culture covers of time more than three thousand years,
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最佳答案：1 when we get to the airport, the plane has already left a hour. 2 the end of la
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最佳答案：1,If she works in the distance, she will miss her family.2,I want to buy two bag