已知f(x)是R上的奇函数,当x>0且x≠1时,(x-1)f'(x)>0,又f(

题型:选择题

问题:

已知f(x)是R上的奇函数,当x>0且x≠1时,(x-1)f'(x)>0,又f(1)=2.则f(x)(  )

A.在x<0时有最小值-2

B.在x<0时有最大值-2

C.在x≥0时有最小值2

D.在x≥0时有最大值2

考点:函数的奇偶性、周期性分段函数与抽象函数函数的单调性与导数的关系
题型:选择题

热力网按敷设方式最常见的为:地沟敷设、()敷设及直埋敷设。

A.高支架

B.浅埋暗挖

C.盾构

D.架空

题型:选择题

读某区域等高线地形图及其地质剖面示意图,回答1~3题。

1、导致图中等温线弯曲的主要原因是[ ]

A、地形和洋流

B、太阳辐射

C、海陆位置

D、大气环流

2、有关图示河流说法正确的是[ ]

A、河流发源地区地质构造为背斜

B、河流径流量季节变化不明显

C、河流以冰川融水补给为主

D、河流流程长,流速快

3、图中⑥表示的岩石为[ ]

A、大理岩

B、页岩

C、玄武岩

D、花岗岩

题型:选择题
根据对话内容,从方框内的选项中选出能填入空白处的最佳选项,选项中有两项为多余选项。
Mrs. Lee: Hello. 68178502.
David:  Hello.  小题1:  ?
Mrs. Lee: Sorry.  小题2: . Can I take a message?
David:  Yes. This is David, Bruce’s friend. I want to ask him for some Chinese ancient coins. He told me he had got some recently.  小题3:  . I don’t care if they were made of different metals. I just want to add some more coins in my collection.
Mrs. Lee: OK. I’ll tell him. Would you like him to ring you back later?
David:  Well, I won’t be at home later this day. Would you please ask him to ring me tomorrow morning?
Mrs. Lee: Sure. 小题4: ?
David:   Oh, sorry.  小题5: .  The new number is 66129853.
Mrs. Lee: OK. I’ll write a message for him.
David:   It’s really nice of you, Madam. Thank you very much. Goodbye!
Mrs. Lee:  Bye!
A. He’s not in at the moment.
B. Who are you?
C. My telephone number has changed.
D. I’m not sure he would give me one or two.
E. Could I speak to Bruce, please?
F.I am very happy to hear that.
G. Has he got your telephone number?
题型:选择题

在一个电气连接部分同时有检修和试验时,可填用一张工作票,但在试验前应得到()的许可

题型:选择题

监理工程师的口头通知,必须在口头通知后()小时内补发书面监理通知。

A.12

B.24

C.48

D.72

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