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【简答题】
设方程 Au xx +Bu xy +Cu yy =0    (2.2.2) 中的常系数A,B,C满足B 2 -4AC=0,A≠0. 证明该方程的通解具有如下形式: u(x,y)=f(mx+y)+xg(mx+y), 其中f,g为任意两个可微函数和m=- .
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举一反三
【单选题】结核杆菌感染是机体患肺结核的
A.
致病因素
B.
诱因
C.
内在因素
D.
遗传因素
E.
危险因素
【简答题】the hard smooth outer suce of your teeth
【简答题】to repay the fund for any money used for other projects
【单选题】本病的病因可能是
A.
结核杆菌感染
B.
病毒感染
C.
寄生虫感染
D.
免疫反应
E.
螺旋菌感染
【简答题】分析生产线平衡的步骤
【单选题】下列句中下划线词没有活用现象的一项是 ...( )
A.
于是余有 叹 焉
B.
其下平旷,有泉 侧 出
C.
.至于 幽暗昏惑 而无物以相之
D.
火尚足以 明 也
【单选题】下列句子中划线的词没有词类活用现象的一项是()
A.
从小丘 西 行
B.
不可久 居
C.
凄 神寒骨
D.
潭 西南 而望
【单选题】单纯疱疹的病因是
A.
金黄色葡萄球菌感染
B.
病毒感染
C.
淋球菌感染
D.
结核杆菌感染
E.
变态反应
【单选题】Assume that projects Alpha and Beta are mutually exclusive. Which of the following statements is true regarding the investment decision tools' suitability for deciding between projects Alpha & Beta?
A.
The incremental IRR should not be used since the projects have different lives
B.
The incremental IRR should not be used since the projects have different discount rates
C.
The incremental IRR should not be used since the projects have different cash flow patterns.
D.
Both the NPV and incremental IRR approaches are appropriate to solve this problem.
【简答题】A.Because they have a smooth suce. B.Because they are very hard. C.Because they are very expensive. D.Because they turn very. well.
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