In the economic point of view, the maintenance methods not only satisfy the minimum cost but also satisfy the minimum safe index.
从经济的观点要求维护方法的费用最小，同时还应满足最小的安全指标。
In the economic point of view, the maintenance methods not only satisfy the minimum cost but also satisfy the minimum safe index.
从经济的观点要求维护方法的费用最小，同时还应满足最小的安全指标。
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