Ancient Chinese architecture features timber framework has several advantages, including______（）
A. time-consuming
B. windows and doors would not be restricted
C. resistant to earthquakes
D. vulnerable to fire
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In Greek myths, why was Prometheus punished by Zeus（）
A. Because he stole fire from Zeus and gave it to humans
Because he did not respect Zeus
C. Because he wanted to be the ruler of heaven
D. Because he had an affair with Hera
Chinesse poetry is good at using（）to display imagery
A. blank space
B. euphemism
C. brush
D. implication
Which of the following assertions for the descent direction is incorrect（）
A. The value of the cost function will decrease along the descent direction
B. For an unconstrained optimization problem,there is no descent direction on the local minimizer of the cost function
C. When one uses the descent direction to construct a iteration algorithm, the step size should be sufficiently large
D. In an optimization problem, the descent direction might not be a feasible direction
If the primal LP problem has optimal solutions, then（）
A. The dual problem is bounded
B. The feasible region of the dual problem is nonempty
C. The dual problem has an optimal basic feasible solution
D. The dual problem is non-degenerate
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