如图所示为小明描绘甲、乙两个物体运动的速度图象.观察图象回答下列问题: (1)记

题型:实验题

问题:

如图所示为小明描绘甲、乙两个物体运动的速度图象.观察图象回答下列问题:

(1)记时开始时,即t=0时,甲的速度是___m/s,乙的速度是____m/s.

(2)第3 s时,甲的速度是_______m/s,乙的速度是______m/s.

(3)甲、乙两个物体分别做______、_______运动;(填:匀速、加速、减速

考点:比较快慢的方法
题型:实验题

For some people, the light of human attention has an unbearable brilliance. Like ivy along the dim edge of a garden, they prefer the social shadows, shunning parties, publicity and fame of any sort. Then there are the flowers of the human arboretum. For them, being in the view of others seems necessary for life itself. From Hollywood to fabricated prime-time reality, this spotlight-dependent species is thriving.

But what about the individuals who crave attention for more desperate reasons Those who resort to unusual ways to get it Lately, it seems, a dark bloom of these characters has emerged. For motives known only to themselves, they have won notoriety by drawing on an almost sacred well of social status, victim hood.

In early April, US national news outlets tracked the disappearance of Audrey Seiler, a sophomore at the University of Wisconsin in Madison. Police and hundreds of concerned citizens searched for four days before Seiler was discovered. Seiler said she was kidnapped. Within hours, however, her story fell apart. Police announced that her abduction had been a hoax. Why would a popular student make herself disappear Her motive remains a mystery, but perhaps it had something to do with the search parties and the news bulletins that surrounded her.

Sympathy is a powerful sentiment that can connect complete strangers. But if it’s used to manipulate, the backlash can be much more intense.

In February, a Waterbury, Connecticut, man was arrested as a result of exploiting sympathy. Edward Valentin told reporters that he had received word that his wife, serving in Iraq, had been killed in an explosion. Police said Valentin admitted the fabrication, reasoning that if people felt sorry for him maybe the military would send his wife home. Evidence, however, points elsewhere.

In its extreme form, such a craving shows up in mental disorders, where sufferers may seek attention by causing themselves harm. But even when it comes with no diagnosis, a deep craving to be noticed can have a wide impact.

For these individuals, victim hood represents a "pure state of guilt-free entitlement," said psychologist Richard Levak, of Del Mar, California. "They go from being utterly deprived to being utterly indulged. In today’s world ... people have become more depressed and disconnected from each other. So you get people who crave affection and attention and approval. They don’t know how to ask for it and they don’t know how to get it. That leaves them vulnerable. " Levak said.

Audrey Seiler did something crazy probably because she wanted to ().

A. challenge the police

B. attract the media

C. experience an adventure

D. beat the crowd

题型:实验题

过原点向曲线y=x3+2x2+a可作三条切线,则实数a的取值范围是______.

题型:实验题

计算机应用中的不安全因素来自计算机( )、软件故障和人为的因素。

A.病毒

B.硬件故障

C.系统错误

D.外部设备故障

题型:实验题

A transport layer protocol has several responsibilities. One is to create a process-to-process (program-to-program) communication; TCP uses port (71) to accomplish this. Another responsibility of a transport layer protocol is to create a (72) and error-control mechanism at the transport level. TCP uses a sliding (73) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve (74) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends (75) of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.

A.procedure

B.function

C.route

D.flow

题型:实验题

三个代表最终落脚点是什么?

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