第二章测试1.If the graphical method is used to solve the linear programming problem, the number of decision variables should be ( ).
A:2
B:≤5
C:≥3
D:No limitation
答案:A
2.In the linear programming model, ( ) restrict the decision variables to zero or positive values.
A:Nonnegativity constraints
B:Resource requirements
C:Objective function
D:The features of variables
3.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 ( ).
A:A straight line connecting two vertices
B:A line segment connecting two vertices
C:It’s impossible
D:Two solutions
4.The following features of standard form of Linear programming are correct（ ）.
A:The decision variables are not equal to zero
B:The decision variables are nonnegative
C:There is no limit to the symbol of decision variables
D:None of above is true
5.The optimal solution of the linear programming problem must be the feasible solution. （ ）
A:对 B:错
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