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【单选题】
热部分密度不均.产生对流运动,从而使热量由一处转移到另一处的热传递形式称为___A.
热辐射
B.
热传导
C.
热对流
D.
对流换热
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【简答题】已知max Z=3x1+4x2+x3,2x1+3x2+x3≤1,x1+2x2+2x3≤3,x1,x2,x3≥0的最优解为X=(1/2,0,0)',则第二种资源的影子价格为[ ]
【简答题】根据上图完成题目 填入恰当的方位词 The school is 1 Grand Avenue The bank is 2 3 the school. The bank is 4 the school 5 the park. The hospital is 6 the school. The school is 7 8 9 10 First Street and Grand Avenue.
【单选题】A) The bank had fired the woman. B) Thewoman used to work for a lawyer. C) Thework in the bank is more interesting. D) Thewoman used to work in a bank.
A.
The bank had fired the woman.
B.
The woman used to work for a lawyer.
C.
The work in the bank is more interesting.
D.
The woman used to work in a bank.
【简答题】已知max Z=60x1+50x2,2x1+4x2≤80,3x1+2x2≤60,x1≤16,x1,x2≥0的最优解(x1,x2)=(10,15),则增加约束x1+2x2≤40的最优解是[ ]
【简答题】已知max Z=3x1+4x2+x3,2x1+3x2+x3≤1,x1+2x2+2x3≤3,x1,x2,x3≥0的最优解为X=(1/2,0,0)',则第一个对偶约束的松驰变量等于[ ]
【简答题】句型转换。 1. The bank is next to the supermarket. (对画线部分提问) the bank? 2. There is a post office near here.(变为一般疑问句，并作否定回答) __ __ a post office near here? __ , ___ _ . 3. The hotel is in front of the resta...
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【简答题】已知max Z=60x1+50x2,2x1+4x2≤80,3x1+2x2≤60,x1≤16,x1,x2≥0的最优解(x1,x2)=(10,15),则增加约束x1+2x2≤40的最优解是[ ]
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