The scheme number three is: a connection rod (12) is hinged between the lower lever (5) and the upper lever (7).
方案三是：下杠杆(5)与上杠杆(7)之间铰接有连杆(12)。
The model of bilevel linear programming which upper lever has without constraint is discussed in this paper, the algorithm which can find all vertexes of the programming is given.
讨论的是上层不带约束的二层线性规划模型，给出了求其所有顶点的算法，此算法为进行二层线性规划的灵敏度分析打下了坚实的基础。
Safety and easy operation: hidden air leaking hole for opening fixture cover easily while pulling up hand lever of the upper cover.
操作方便，安全：隐藏式泄气孔，拉起上盖把手即可打开治具，操作简易，安全性高。
Install shoe upper and lower return sprinNeedle nose pliers can be used to connect spring to each shoOperate lever to verify that shoes expand and retract properly.
安装蹄片上部和下部返回弹簧。使用针针嘴钳连接弹簧至每个蹄片。操作拉杆确认蹄片放开和收回正确。
A control lever runs through a lower fertilizer passage below the fertilization box, with the upper end provided with a raised head which reaches an exit inside the fertilization box.
施肥箱下方的下肥道内贯穿有控制杆，上端设有凸头，达接在施肥箱内的出口上。
A control lever runs through a lower fertilizer passage below the fertilization box, with the upper end provided with a raised head which reaches an exit inside the fertilization box.
施肥箱下方的下肥道内贯穿有控制杆，上端设有凸头，达接在施肥箱内的出口上。
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