设u=f(xy，x2-y2，x)，其中函数f有二阶连续偏导数，试求：(Ⅰ)du；(Ⅱ

发布时间：2018-06-05 23:24 │ 来源：www.tikuol.com

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问题：

设u=f(xy，x²-y²，x)，其中函数f有二阶连续偏导数，试求：(Ⅰ)du；(Ⅱ)

考点：普通考研考研数学(一)考研数学一

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关于工程设计质量管理的说法，错误的是（）。

A．安排施工图的强制性审查

B．组织安排编制工程量清单及施工图预算，确保预算准确且不超过给定的投资控制指标及浮动的限度

C．分析、论证项目设计总进度目标

D．组织全部施工图的质量审查，最大限度地减少各专业施工图样的“错、漏、碰、缺”

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完形填空。

   Lana's birthday    1 . We planned to give her a surprise party. I think I can   2 her a big cake with beautiful
candles. Sally said she 3 some drinks and snacks. The party   4 in my house. I   5 a phone call to Frank to
ask him to join us this morning. He   6 TV then. He promised that he   7 in time and bring some flowers to
Lana. Eric said he   8 his robot to the party. The robot   9 all kinds things for us. We all hope Lana   10
happy.

( ) 1.A.come
(   ) 2.A.get
(    ) 3.A.will bring
(   ) 4.A.would hold
(     ) 5.A.makes
(    ) 6.A.was watching
(   ) 7.A.come
(   ) 8.A.will bring
(   ) 9.A.could do
(    ) 10.A.would be

B. will coming
B. got
B. would bring
B. will be held
B. will make
B. watched
B. comes
B. would bring
B. will do
B. could be

C. is coming
C. gets
C. brought
C. was held
C. am making
C. watches
C. would come
C. brings
C. can do
C. will be

D. came
D. getting
D. was bringing
D. hold
D. made
D. watch
D. will come
D. brought
D. would do
D. can be

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甲状腺摄碘试验检查前。病人应禁食含碘食物多长时间

A．1天

B．4～6周

C．4～6天

D．1周

E．3天

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下图为我国北方某市某季降水量等值线图（单位：mm）。读图，回答下列各题。

M地与周边地区降水量差异及成因是（）

A.降水量比周边地区多——受季风的影响强

B.降水量比周边地区少——受建筑物的阻挡，风力小

C.降水量比周边地区多——受城市热岛环流的影响

D.降水量比周边地区少——地处平原，无法形成上升气流

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现场勘验是对现场遗留的与犯罪有关的物品进行提取、保全的活动。( )

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