The purpose of break-even analysis is to determine the number of units of a product to sell or produce that will equate total revenue with total cost. At the break-even point, the profit is ( ) zero.
答案: 【equal to】
In general, an increase in variable costs will（ ）the break-even point, all other things held constant.
It’s important to make full use of techniques in management science process, which techniques are commonly used for the purpose of decision-making（ ）?
B:Transportation and assignment
C:Project management (like CPM/PERT)
D:Linear programming models
答案: 【Decision analysis;Transportation and assignment;Project management (like CPM/PERT);Linear programming models】
Manufacturing companies develop linear programming models to help decide how many units of different products they should produce to maximize their profit (or minimize their cost), given scarce resources such as capital, labor, and facilities. ( ）
If the graphical method is used to solve the linear programming problem, the number of decision variables should be ( ).
In the linear programming model, ( ) restrict the decision variables to zero or positive values.
A:The features of variables
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 ( ).
A:A straight line connecting two vertices
C:A line segment connecting two vertices
答案: 【A line segment connecting two vertices】
The following features of standard form of Linear programming are correct（ ）.
A:The decision variables are nonnegative
B:The decision variables are not equal to zero
C:None of above is true
D:There is no limit to the symbol of decision variables
答案: 【The decision variables are nonnegative】
The optimal solution of the linear programming problem must be the feasible solution. （ ）