We establish the theoretical model for the relationship between the vertical load and vertical displacement of a driver's seat suspension system that contains two level-layout linear spiral springs.

建立了一种含两水平布置线性弹簧的驾驶员座椅悬架系统垂向力与垂向位移特性关系的理论模型。

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Dry running linear diaphragm pumps. Two means of actuation: linear and vibrating armature. Very high life time, low noise level and high efficiency. Used as compressors and vacuum pumps.

空运行线性隔膜泵。两种气动方法：线性和振动电枢。具有很高的使用寿命，低的噪音和高性能。可用作压缩机和真空泵。

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The nonlinear equation group expressed by infinite series was made up in the condition of different water level and recharge quantity on two lateral linear recharge boundary.

对于两侧直线补给边界水位和补给流量不同的情况，建立了无穷级数表达的非线性方程组；

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