【判断题】【消耗次数：1】
线性规划可行域无界,则具有无界解。（）
①
正确
②
错误
参考答案：
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相关题目
【单选题】
线性规划具有无界解是指（）。
①
可行解集合无界
②
有相同的最小比值
③
存在某个检验数λk＞0且aik≤0（i=1,2，…,m）
④
最优表中所有非基变量的检验数非零
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There was a knock at the door. It was the second time someone ＿＿＿＿＿ me that evening.
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to have interrupted
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would have interrupted
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to interrupt
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had interrupted
【单选题】
He didn’t show up at the party yesterday. He ＿＿＿＿ in the lab.
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must have been busy working
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must be busy wording
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must be busy to work
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would have been busy working
【单选题】
Marlin is an independent man who is not about ＿＿＿＿＿ on his parents any more.
①
having relied
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to rely
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relying
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to have relied
【单选题】
It ＿＿＿＿＿ for over a month and the downpour had damaged many houses.
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has rained cats and dogs
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has been raining heavily
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rained heavily
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had been raining cats and dogs
【单选题】
Between 1897 and 1919, at least 29 motion pictures ＿＿＿＿＿ .
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have been produced
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had been produced
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had produced
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would have produced
【单选题】
At the age of twenty-three, Emily ＿＿＿＿＿＿ a businessman of her own choice.
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had been married
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had married
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married
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was married
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In order to improve English, ＿＿＿＿＿＿.
①
Jane’s father bought her a lot of tapes
②
Jane bought a lot of tapes for herself
③
a lot of tapes were bought for her by Jane’s father
④
a lot of tapes were bought by Jane
【单选题】
I ＿＿＿＿＿＿ to stay here if I can.
①
have been meaning
②
mean
③
am meaning
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have meant
【单选题】
They had only ＿＿＿＿＿＿＿＿＿ in that house for three weeks when fire destroyed it.
①
to live
②
living
③
lived
④
been lived
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In the USA, he made a lot of friends ＿＿＿＿＿＿ English well so he could make himself ＿＿＿＿＿＿.
①
learn, understand
②
to learn, understood
③
learning, understood
④
learn, understanding