How to design construction scaffolding is the key point in the maintenance construction of space grid structures.
在空间网架维护施工中，如何设计施工脚手架是工程的关键。
Detection and maintenance after the operating are the key point to extend the useful life of cable suspension bridge.
延长悬索桥有效寿命的关键是对悬索桥运营后的检测及维修。
Chart 4 gives a detailed analysis for the maintenance cost control of Air China Southwest Company. It explains how to apply the various theory of maintenance cost control at each key point.
第四部分结合国航西南公司维修成本制约实践，通过对国航西南公司各环节维修成本制约的案例浅析浅析，说明维修成本制约理论模式在维修成本制约不同、环节的具体应用。
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