How much life time calculation, the value of life by contribution calculation.
生命多少用时间计算，生命的价值用贡献计算。——裴多菲。
How much time calculation of life, the life value with contribution calculation.
生命的多少用时间计算，生命的价值用贡献计算。
By the derivation, calculation and illustration it is testified that the that of stroke, transmission efficiency, linearity and life time meet the design requirements.
通过推导计算与实例证明，该驴头的行程、传动效率、线性度和寿命都满足设计要求。
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