第二章If the graphical method is used to solve the linear programming problem, the number of decision variables should be ( ).
答案:2
In the linear programming model, ( ) restrict the decision variables to zero or positive values.
答案:Nonnegativity constraints
If the optimal solution of the linear programming problem is reached at two vertices of feasible domain at the same time, then the optimal solution has ( ).
答案:A line segment connecting two vertices
The following features of standard form of Linear programming are correct（ ）.
答案:The decision variables are nonnegative
The optimal solution of the linear programming problem must be the feasible solution. （ ）
答案:对
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