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要有效地克服这些力(矩),还可以加装起特定功效的杆系,如推力杆、A形架或V形杆,但这将增加成本费并使结构特征复杂。为尽量避免空气悬架间的差价,就产生了取消这类杆系以优化结构特征的设想,这一点对成本费矛盾突显的挂车来讲更加迫切。