Then, give the economic significance and calculational methods of these four kinds calculational methods.

然后, 重点介绍了四种类型的技术进步贡献的经济意义及计算方法.

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The results provide calculational basis to the aiming mechanism design of ship - borne rocket launcher system.

计算结果为舰载火箭炮瞄准机的设计提供了依据.

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