肝性脑病患者前驱期的突出表现为()A．精神异常 B．定向力减退 C．性格和行为异常

不良工况评价在设备经受不良工况后（）内完成。

如图所示，以O为原点建立平面直角坐标系Oxy，沿y轴放置一平面荧光屏，在y＞0，0＜x＜0.5m的区域有垂直于纸面向里的匀强磁场，磁场的磁感应强度大小B=0.5T。在原点O放一个开有小孔粒子源，粒子源能同时放出比荷为q/m =4.0×10⁶kg/C的不同速率的正离子束，沿与x轴成30°角从小孔射入磁场，最后打在荧光屏上，使荧光屏发亮。入射正离子束的速率在0到最大值v_m=2.0×10⁶m/s的范围内，不计离子之间的相互作用，也不计离子的重力。

（1）求离子打到荧光屏上的范围。

（2）若在某时刻（设为t=0时刻）沿与x轴成30°角方向射入各种速率的正离子，求经过s时这些离子所在位置构成的曲线方程。

（3）实际上，从O点射入的正离子束有一定的宽度，设正离子将在与x轴成30°～60°角内进入磁场。则某时刻（设为t=0时刻）在这一宽度内向各个方向射入各种速率的离子，求经过s时这些离子可能出现的区域面积。

The argument over a Philadelphia school district accused of secretly spying on pupils through laptop cameras became fiercer today after it acknowledged obtaining more than 56,000 images of its students, many of them in their homes.

When the scandal (丑闻) first broke, it was believed that only a few pictures had been taken of one pupil, Blake Robbins. But court papers released this week showed that thousands of images were taken of Robbins and other students.

Robbins and his parents have filed an action against the school district. Court papers from the Robbins’s lawyers said that at first it was thought that the laptops’ technology had produced a few images but they found more than 400 of Robbins, including images “showing him partially undressed and sleeping”.

Robbins said he did not know why the spying device was activated (激活) as his laptop had not been reported stolen or missing. Other students whose pictures were taken said their laptops had not been reported stolen or missing either.

An administrator at the school, one of the few with authority to track the laptops, remained silent, refusing to answer questions.

The Philadelphia Inquirer reported that 38,500 of the images came from six laptops that had been reported missing from the Harriton gym in September 2008. These apparently helped the police catch a suspect. Another set of images were from cameras in laptops which employees responsible for tracking failed or forgot to turn off.

The court papers, filed by Robbins’ lawyers, said that the technology was activated between 20 October and 4 November last year, with most of the 400 shots of him while he was in his home, and included his family. “There were additional webcam pictures and screen shots taken of Blake Robbins which, up to now, have not been recovered because the evidence was deleted by the IT department,” the court papers say.

One of Robbins’ lawyers is trying to obtain access to the administrator’s home computer to confirm whether she downloaded any of the pictures. The court papers indicate she may be a voyeur (窥隐私者) though it has not been proved.

小题1:We can learn from the passage that _________.

A．Robbins’ parents remained calm over the scandal

B．Robbins had his laptop stolen before the scandal

C．the laptops’ technology produced some images

D．the private rights of the students were offended小题2:What did The Philadelphia Inquirer say about the case?

A．The police had found some evidence.

B．Most of the laptops in Harriton gym were missing.

C．Employees in charge of tracking deliberately left the laptops on.

D．There was obviously more than one suspect related to the case.小题3:According to the court papers, the administrator _________.

A．may have spied her students on purpose

B．may have broken into Robbin’s house

C．has downloaded many students’ pictures

D．has removed evidence from computers小题4: What does the passage mainly talk about?

A．Modern technology has negative effects on our lives.

B．Students in Philadelphia are accustomed to being spied on secretly.

C．A Philadelphia school is charged with spying students through laptop cameras.

D．The American government should take measures to improve teachers’ qualities.

卡诺循环的热效率仅决定于（）。

水痘的主要病位在：（）

A.脾胃

B.肺胃

C.肺脾

D.肺卫

E.肝肾