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