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【单选题】
下列说法正确的为( )A.
如果线性规划的原问题存在可行解,则其对偶问题也一定存在可行解
B.
如果线性规划的对偶问题无可行解,则原问题也一定无可行解
C.
在互为对偶的一对原问题与对偶问题中,不管原问题是求极大或极小,原问题可行解的目标函数值都一定不超过其对偶问题可行解的目标函数
D.
如果线性规划问题原问题有无界解,那么其对偶问题必定无可行解
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皮皮学刷刷变学霸
举一反三
【多选题】When the passenger is worried about a minor fire, you can say ______.
A.
The fire is under our control.
B.
We are fightig against it.
C.
There is nothing you can do about it.
D.
Our flight attendants are very experienced.
【单选题】Let's _______ about the plan. Can you _______ English? [ ]
A.
say, speak
B.
talk, speak
C.
say, say
D.
talk, speak
【单选题】---Can you say something about Wenchuan earthquake (汶川地震)? ---___________ people lost their lives in it.
A.
Thousand
B.
Thousands of
C.
Three thousands
D.
Three thousands of
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