我国最早着手建设专用计算机广域网的是,【判断题】我国最早着手建设专用计算机广域网的是铁道部。（ ）...

【判断题】我国最早着手建设专用计算机广域网的是铁道部。( )

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My sister often helps me _______ my lessons.[ ]A. to B. at C. about D. with

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