This paper tries to build up the strategy of suppliers by analyzing the purchase strategy of the lever balance and the purchase combination.
通过杠杆平衡采购战略分析和采购组合分析，来构建供应商战略。
The working principle of a kind of hydraulic-mechanical combination driving device based on lever-toggle force-amplifier was introduced in the article, its force calculation formulas are given also.
介绍了一种基于杠杆-铰杆增力机构的液压-机械复合传动装置的工作原理，给出了其力学计算公式。
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