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已知全集U={l，2，3，4，5，6，7}，A={2，4，5），则? U A=（ ） A．{1，3，5，6，7} B．{1，3，4，6，7} C．（1，4，5，6，7} D．{1，3，6，7}
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利用宏观调控手段促进生态良性循环
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