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A 6-wheel model of towed howitzer train is made.
建立了牵引火炮列车6轮输入模型；
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System optimal design of howitzer is an important tool of system design.
火炮总体优化设计是总体设计的重要工具。
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System optimal design of howitzer is an important tool of system design.
火炮总体优化设计是总体设计的重要工具。
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