人类社会发展中有战争的存在，更有对和平的追求。阅读材料，回答问题。

材料一：第十六条联盟会员国如有不顾本约所规定而从事战争者，则据此事实，应视为对于联盟所有其他会员国有战争行为，其他会员国应即与之断绝各种商业上或财政上之关系，禁止其人民与破坏盟约国人民之各种来往，并阻止其他任何联盟会员国或非会员国之人民与该国人民之财政上、商业上或个人之来往。

——《国际联盟盟约》

材料二：依照顾问会议所提办法，设立一种特殊制度治理东三省；此项为满洲而设之自治制度，拟仅施行于辽宁（奉天）、吉林、黑龙江三省。

——李顿“国联调查团”报告书

材料三：《非战公约》是在20世纪20年代后期欧美盛行“和平主义”的形势下，欧洲政治和美国政治交错发展到一定阶段中的产物。它既没有杜绝秘密外文，也没有解决裁军问题。但是从国际法的角度来看，它还是一个重要文件，因为它强调了不侵犯的原则。然而，当真正的危机来临时，它只能成为纸上的“非战”。

——袁明《国际关系史》

材料四：联合国宪章确定的宗旨和原则，对维护世界和平与安全发挥着举足轻重的作用，已经成为公认的国际关系基本准则，必须得到切实遵循。

应该鼓励和支持以和平方式，通过协商、谈判解决国际争端或冲突，发展事关各国人民的切身利益，也事关消除全球安全威胁的根源，没有普遍发展和共同繁荣，世界难享太平。

——摘自***在联合国成立60周年首脑会议上的讲话

利用如图1所示的电路测定电源的电动势和内电阻，提供的器材有

A．干电池两节，每节电池的电动势约为1.5V，内阻未知

B．直流电压表V₁、V₂，内阻很大

C．直流电流表A，内阻可忽略不计

D．定值电阻R₀，阻值未知，但不小于5Ω

E．滑动变阻器

F．导线和开关

如果$a<b<0$，那么(     )．

根据短文理解，选择正确答案。

HOLIDAY FUN AT THE POWERHOUSE

500 HARRIS STREET ULTIMO·TELEPHONE

( 02 ) 9217 0111

    Join in the holiday fun at the Powerhouse this month linked to our new exhibition, Evolution & Revolution: Chinese dress 1700s to now. DON'T FORGET our other special event, the Club Med Circus School which is part of the Circus(马戏团)！150 years  of circus in Australia exhibition experience!

◆Chinese Folk Dancing: Colourful Chinese dance and musical performances by The Chinese Folk Dancing School of Sydney. Dances include: the Golden stick dance and the Chinese drum dance. A feature will be the Qin Dynasty Emperor's court dance. Also included is a show of face painting for Beijing opera performances.

    Sunday 29 June and Wednesday 2 July in the Turbine Hall, at 11：30 am & 1：30 pm.

◆Australian Chinese Children's Arts Theatre: Well­known children's play experts from Shanghai lead this dynamic youth group. Performances include Chinese fairy tales and plays.

    Thursday 3 to Sunday 6 July in the Turbine Hall, at 11：30 am & 1：30 pm.

◆Chinese Youth League: A traditional performing arts group featuring performance highlights such as Red scarf and Spring flower dances, and a musician playing Er Hu.

    Sunday 6 to Tuesday 8 July in the Turbine Hall, 11：30 am to 1：30 pm.

◆Kids Activity: Make a Paper Horse: Young children make a paper horse cut­out. (The horse is a frequent theme in Chinese painting, indicating a kind of advancement.) Suitable for ages 8～12 years.

    Saturday 28 June to Tuesday 8 July in the Turbine Hall, 12：00 pm to 1：00 pm.

◆Club Med Circus School: Learn circus skills, including the trapeze, trampolining and magic. Note only for children over 5. There are 40 places available in each 1 hour session and these must be booked at the front desk, level 4, on the day.

Tuesday 1 to Saturday 5 July at 11：30 am & 1：00 pm.

    Enjoy unlimited free visits and many other benefits by becoming a family member of the Powerhouse. Our family memberships cover two adults and all children under the age of 16 years at the one address.

    Members receive Powerline, our monthly magazine, discounts in the shops and the restaurants, as well as free admission to the Museum. All this for as little as $50.00 a year! Call (02)9217 0600 for more details.