晶体三极管工作时有3种工作状态（）、截止、饱和.

利用下图装置做下面的实验：在烧杯中盛有半杯乙溶液，然后用滴定管向容器中滴入甲溶液。随着甲的滴入，灯泡逐渐变 暗；滴到一定量时，灯泡熄灭，继续滴入甲溶液，灯泡又逐渐变亮。下列各组溶液中，能够产生上述现象的是

读图回答下列各题

小题1:图中甲山为旅游名山，其海拔为1474米，有关该山地质构造及地貌的说法正确的是

A．褶皱构造，块状山地

B．断层构造，褶皱山脉

C．褶皱构造，褶皱山脉

D．断层构造，块状山地小题2:甲山与乙地比较说法正确的是

A．甲山降水少于乙地，甲山顶气温的日较差大于乙地

B．甲山降水多于乙地，甲山顶气温的日较差大于乙地

C．甲山降水少于乙地，甲山顶气温的日较差小于乙地

D．甲山降水多于乙地，甲山顶气温的日较差小于乙地

阅读理解

    What can a wide eyed, talking robot teach us about trust? A lot, according to Northeastern

psychology professor David DeSteno, and his colleagues, who are conducting a research to determine

how humans decide to trust strangers.

     The interdisciplinary(跨学科的)research project, funded by the National Science Foundation(NSF),

is being conducted together with Cynthia Breazeal, director of the MIT Media Lab's Personal Robots

Group, Robert Frank, an economist, and David Pizarro, a psychologist, both from Cornell.

     The researchers are examining whether gestures could affect our trustworthiness judgments. "People

tend to mimic(模仿)each other's body language, "said De Steno, "which might help them develop

intuitions(直觉)about what other people are feeling."

     This project tests their theories by having humans interact with the social robot, Nexi, in an attempt to

judge her trustworthiness. Without knowing the participants, Nexi has been programmed to make

gestures while speaking with selected participants-gestures that the team thinks could determine whether

or not she's considered trustworthy.

    During the first part of the experiment, Nexi makes small talk with them for 10 minutes, asking and

answering questions about topics such as traveling, where they're from and what they like most about

living in Boston.

    "The goal was to create a normal conversation with accompanying movements to see what the mind

would intuitively(直觉地)collect about the trustworthiness of another, "said DeSteno.

     The participants then play an economic game called "Give Some", which asks them to determine how

much money Nexi might give them at the expense of her individual profit. Meanwhile, they decide how

much, if any, they'll give to Nexi. The rules of the game allow for two distinct outcomes:higher individual

profit for one and loss for the other, or relatively smaller and equal profits for both partners.

    "Trust mightn't be determined by only one gesture, but rather a 'dance' that happens between the

strangers, which leads them to trust or not trust the other, " said DeSteno, who will continue testing their

theories by seeing if Nexi can be taught to predict the trustworthiness of human partners.

1. How many fields does the research involve?

A. Two fields.  

B. Three fields.

C. Four fields.  

D. Five fields.

2.  According to the text, the researchers focused on ________.

A. the writing communication

B. the voice communication

C. the gesturebased communication

D. the online communication

3. According to the text, the first part of the experiment is to ________.

A. create a special conversation

B. intuitively watch the trustworthiness

C. accompany the robot closely

D. play an economic game

4. The underlined word "dance" in the last paragraph means ________.

A. the gestures from each other

B. a kind of entertainment

C. a simple gesture

D. one person's gestures

何谓聚类？它与分类有什么异同？

T12钢从770℃缓冷到室温时的显微组织为（）

A.珠光体+铁素体

B.珠光体+渗碳体

C.珠光体

D.铁素体+渗碳体