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良好的膜分离设备应具有的哪些条件？
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裴李岗文化遗址位于新郑县城西北7.5公里裴李岗村西台地上。
氮气和二氧化碳是泡沫压裂液体系中的两种重要的气相。（）
Write a memo in about 50 words. You are Human Resources Manager. Your company is going to provide the staff with training in E-Commerce. There will be two course levels: intermediate level and advanced level. The training course will be given on Saturdays for five weeks. Write a memo to department managers: ·Informing them of the coming training course; ·Asking them to encourage the staff to participate; ·Asking them to help obtain the names of the interested staff.
鱼类、甲壳类味道鲜美有关的呈味物质有（）。
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