The scheme number three is: a connection rod (12) is hinged between the lower lever (5) and the upperlever (7).
方案三是:下杠杆(5)与上杠杆(7)之间铰接有连杆(12)。
2
The model of bilevel linear programming which upperlever has without constraint is discussed in this paper, the algorithm which can find all vertexes of the programming is given.