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盾构技术一度为西方所垄断，2008年以前，我国盾构机几乎都靠进口，现在，国产盾构机打破西方垄断完成逆袭 。2023-10-19 11:55
19日上午，神舟十七号载人飞船与长征二号F遥十七运载火箭组合体已转运至发射区，计划近日择机实施发射。2023-10-19 11:45
