高危地区的概念？

如图，一质量不计，可上下自由移动的活塞将理想气体封闭在圆筒内，筒的侧壁为绝缘体，下底M及活塞D均为导体并按图连接，活塞面积S=2cm²。闭合电键前，DM间距l₁=5μm，闭合电键后，活塞D与下底M分别带有等量异种电荷，并各自产生匀强电场（D与M间的电场为各自产生的电场的叠加）。在电场力作用下活塞D发生移动。稳定后，DM间距l₂=4μm，此时安培表读数为0.75A，伏特表读数为2V。

（1）求出活塞受到的电场力大小F（大气压强，活塞移动前后气体温度不变）；

（2）求出活塞D所带电量q；

（3）一段时间后，一个电阻发生故障，安培表读数变为0.8A，伏特表读数变为3.2V，请判断是哪个电阻发生了故障？是短路还是断路？筒内气体压强变大还是变小？

（4）已知R₃＝4Ω，能否求出R₁、电源电动势E和内阻r的阻值？如果能，求出结果，如果不能，说明理由。

据财政部网站消息，财政部将于2010年9月16日起发行2010年记账式附息国债，本期国债实际发行面值金额为282．6亿元，票面年利率为3．29%。下列对国债的理解正确的是

①国债对于购买者来说是一种所有权凭证

②国债对于购买者来说是一种债权凭证

③国债由国家担保，没有风险

④国债的收益较银行利息高

A．①②

B．③④

C．②③

D．②④

做排骨时加醋，骨中的钙可生成易被人体吸收的（）

A、醋酸钙

B、钙盐

C、无机钙

D、含钙化合物

补全短文：下面的短文有5处空白，短文后有6个句子，其中5个取自短文，请根据短文内容将其分别放回原有位置，以恢复文章原貌。

Wrongly Convicted Man and His Accuser Tell Their Story。

NEW YORK,NY, January 5,2010. St.Martin’s Press has announced the release of the paperback edition of Picking Cotton, a remarkable true story of what novelist John Grisham calls an “account of violence, rage, redemption(救赎)，and, ultimately forgiveness.”　　

The story began in 1987, in Burlington, North Carolina, with the rape of a young while college student named Jennifer Thompson. During her ordeal, Thompson swore to herself that she would never forget the face of her rapist, a man who climbed through the window of her apartment and assaulted her brutally.________(1) When the police asked her if she could identify the assailant(袭击者) from a book of mug shots, she picked one that she was sure was correct, and later she identified the same man in a lineup.

Based on her convincing eyewitness testimony, a 22-year-old black man named Ronald Cotton was sentenced to prison for two life terms. Cotton’s lawyer appealed the decision, and by the time of the appeals hearing, evidence had come to light suggesting that the real rapist might have been a man who looked very like Cotton, an imprisoned criminal named Bobby Poole._______ (2) Jennifer Thompson looked at both men face to face, and once again said that Ronald Cotton was the one who raped her.

Eleven years later, DNA evidence completely exonerated(证明……清白) Cotton and just as unequivocally(明确地) convicted Poole, who confessed to the crime. ________(3) “The man I was so sure I had never seen in my life was the man who was inches from my throat, who raped me, who hurt me, who took my spirit away, who robbed me of my soul,” she wrote. “And the man I had identified so surely on so many occasions was absolutely innocent.”

_______ (4) Remarkably both were able to put this tragedy behind them, overcome the racial barrier that divided them, and write a book, which they have subtitled “Our memoir of injustice and redemption.”

Nevertheless, Thompson says, she still lives “with constant pain that my profound mistake cost him so dearly______ (5)”

47 （单项选择题）          

A.Thompson was shocked and devastated.

B.Another trial was held.

C.I cannot begin to imagine what would have happened had my mistaken identification occurred in a capital case.

D.During the attack, she made an effort to memorize every detail of his face , looking for scars , tattoos (纹身) or other identifying marks.Jennifer

E.Many criminals are sent to prison on the basis of accurate testimony by eyewitnesses.

F.Jennifer Thompson decided to meet Cotton and apologize to him personally.

常用的音乐合成技术有（）两种方式。

A.FM（调频）和WaveTable（波表）

B.FM（调频）和AM（调幅）

C.AM（调幅）和WaveTable（波表）

D.FM（调频）和功率放大