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主要是苏联大口径炮弹生产采用金属挤压延展工艺,成品率低,生产速度慢,成本高。80年代获得美国大口径炮弹生产采用的金属焊接工艺才解决问题,口径当然就是155MM

starw (starwar)
(#11862752@0)
1-1 -04:00
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