本文通过对预应力混凝土屋架的荷载-挠度曲线分析，说明预应力混凝土屋架在强度极限状态时，屋架的挠度是不小的。因此，由屋架的变位引起的上弦次弯矩影响是不可忽略的。
Through the analysis of the load-deflection curves of prestressed concrete roof trusses, it is shown that these trusses deflect a considerable amount in the state of ultimate strength.
文章为“品牌战”替代“价格战”提供了理论依据，即通过品牌建设提高品牌信用度，使得在价格提高的条件下需求量增加，而这只有在需求曲线改变位置时方能做到。
Therefore, this paper provides a practical means for firms to escape from the trap of price war and substitute brand war for price war through brand construction to increase brand credit degree.
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