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【单选题】
一对互为对偶的问题存在最优解，则下列说法错误的是（ ）
A.
若某个约束为严格的不等式，则相应的对偶变量取值为 0
B.
若某个变量取值为正，则相应的对偶约束必为等式
C.
若某个约束为等式，则相应的对偶变量取值为 0
D.
若某个对偶变量取值不为0，则其对应的约束条件必为等式约束。
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举一反三
【多选题】设f(x)在[a，b]上连续，则下列式子成立的有(    )．
A.
B.
C.
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【单选题】法律规则是法律的基本构成要素。下列关于法律规则分类的表述哪一项可以成立?
A.
A《律师法》T14规定：没有取得律师执业证书的人员，不得以律师名义执业，不得为牟取经济利益从事诉讼代理或者辩护业务。“此规定为义务性规则
B.
B《中小企业促进法》T31规定：国家鼓励中小企业与研究机构、大专院校开展技术合作、开发与交流，促进科技成果产业化，积极发展科技型中小企业。此规定为强行性规则。
C.
C《宪法》T40：中华人民共和国公民的通信自由和通信秘密受法律的保护。除因国家安全或者追查刑事犯罪的需要，由公安机关或者检察机关依照法律规定的程序对通信进行检查外，任何组织或个人不得以任何理由侵犯公民的通信自由和通信秘密。此规定为命令性规则。
D.
D《医疗事故处理条例》T62规定：军队医疗机构的医疗事故处理办法，由中国人民解放军卫生主管部门会同国务院卫生行政部门依据本条例制定。此规定为准用性规则
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【单选题】What is the main problem?
A.
He doesn't know what color his friend likes in a gift.
B.
His friend has a broken knapsack.
C.
The gift he wants isn't there.
D.
He doesn't know what his friend will find useful in a gift.
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【单选题】In the ________ of the race between the tortoise and the hare, the tortoise wins, even though he is slow, because he keeps going with determination.
A.
fable
B.
tale
C.
story
D.
saga
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【判断题】T he tortoise is friendly. ( )
A.
正确
B.
错误
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【单选题】若运行时为变量x输入12，则以下程序的运行结果是#includevoidmain(){intx,y;scanf("%d",&x);y=x>12?x+10:x-12;printf("%d\n",y);return0;}
A.
4
B.
3
C.
22
D.
0
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【单选题】In the race between the hare and the tortoise, the tortoise ______.
A.
won the final laugh
B.
had the final laugh
C.
got the last laugh
D.
made the last laugh
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【简答题】Mark Twain was an American writer.One day he went to a city by train.He wanted to see one of his friends there.He was a very busy man.He usually forgot something.When he was in the train, the conducto...
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【简答题】阅读理解。 The Blacks are American tourists. They visit in Beijing now. This is their first visit to China. They are going to stay  in China for three months. They want to visit some big cities and village...
查看完整题目与答案
【单选题】When he heard the _______ news that an earthquake occurred in Sichuan, he felt very___________.
A.
frightened; frightened
B.
frightened; frightening
C.
frightening; frightening
D.
frightening; frightened
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相关题目：
【多选题】设f(x)在[a，b]上连续，则下列式子成立的有(    )．
A.
B.
C.
查看完整题目与答案
【单选题】法律规则是法律的基本构成要素。下列关于法律规则分类的表述哪一项可以成立?
A.
A《律师法》T14规定：没有取得律师执业证书的人员，不得以律师名义执业，不得为牟取经济利益从事诉讼代理或者辩护业务。“此规定为义务性规则
B.
B《中小企业促进法》T31规定：国家鼓励中小企业与研究机构、大专院校开展技术合作、开发与交流，促进科技成果产业化，积极发展科技型中小企业。此规定为强行性规则。
C.
C《宪法》T40：中华人民共和国公民的通信自由和通信秘密受法律的保护。除因国家安全或者追查刑事犯罪的需要，由公安机关或者检察机关依照法律规定的程序对通信进行检查外，任何组织或个人不得以任何理由侵犯公民的通信自由和通信秘密。此规定为命令性规则。
D.
D《医疗事故处理条例》T62规定：军队医疗机构的医疗事故处理办法，由中国人民解放军卫生主管部门会同国务院卫生行政部门依据本条例制定。此规定为准用性规则
查看完整题目与答案
【单选题】What is the main problem?
A.
He doesn't know what color his friend likes in a gift.
B.
His friend has a broken knapsack.
C.
The gift he wants isn't there.
D.
He doesn't know what his friend will find useful in a gift.
查看完整题目与答案
【单选题】In the ________ of the race between the tortoise and the hare, the tortoise wins, even though he is slow, because he keeps going with determination.
A.
fable
B.
tale
C.
story
D.
saga
查看完整题目与答案
【判断题】T he tortoise is friendly. ( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】若运行时为变量x输入12，则以下程序的运行结果是#includevoidmain(){intx,y;scanf("%d",&x);y=x>12?x+10:x-12;printf("%d\n",y);return0;}
A.
4
B.
3
C.
22
D.
0
查看完整题目与答案
【单选题】In the race between the hare and the tortoise, the tortoise ______.
A.
won the final laugh
B.
had the final laugh
C.
got the last laugh
D.
made the last laugh
查看完整题目与答案
【简答题】Mark Twain was an American writer.One day he went to a city by train.He wanted to see one of his friends there.He was a very busy man.He usually forgot something.When he was in the train, the conducto...
查看完整题目与答案
【简答题】阅读理解。 The Blacks are American tourists. They visit in Beijing now. This is their first visit to China. They are going to stay  in China for three months. They want to visit some big cities and village...
查看完整题目与答案
【单选题】When he heard the _______ news that an earthquake occurred in Sichuan, he felt very___________.
A.
frightened; frightened
B.
frightened; frightening
C.
frightening; frightening
D.
frightening; frightened
查看完整题目与答案