光伏发电站无功补偿可采取的方式为（）。A.靠光伏发电站逆变器自身能力提供无功输出 B

A City Card ●for all trains and buses within the city (London) ●free travel for all journeys ●can be used for 30 days ●￡80	B Network Card ●for long-distance trains and city trains (London) ●25% off all tickets ●can be used for 12 months ●￡70
C Point-to-Point Card ●for long-distance trains and buses only ●50% discount on all journeys ●can be used for 12 months ●￡70	D Concession Card ●for all trains and buses within the city (London) ●free city travel for students (under 21 years of age) and retirees (over 60 years of age) only ●can be used for 30 days ●￡25
E Group Card ●for long-distance trains only ●50% off all train journeys for 4 people (2 adults and 2 children) ●can be used for 90 days ●￡130	F Daily Card ●for all trains and buses within the city (London) ●free travel for all journeys ●can be used for 24 hours ●￡8

请阅读下列购买者的信息，然后买者拟购买的交通卡：
( )1. Margaret-is a 65-year-old retired woman who lives in Glasgow, Scotland and visits her sister in
London four times a year. She usually takes the long-distance train on these journeys and the normal return
train fare is ￡50.
( )2. Bill-is a student living in London and needs to catch the bus to and from university every weekday.
The normal cost of the fare is ￡3 each way.
( )3. Robert-will visit London for l day with his family (wife and 2 daughters) and plans to use the public
transport system to see as much of the city as possible. According to his plan they will be catching at least
5 buses or trains that day. Average cost of each fare is ￡3 per person.
( )4. Jill is a 40-year-old mother who lives in West London and has to travel to the city centre for work
each day. To get there she needs to catch a bus to the train station then board the train to work Average cost
of each ticket is ￡3.
( )5. Albert-is a salesman who mainly visits his customers in the city but must also travel to other parts of
the country at least twice each month He prefers to travel by train.

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题型：多项选择题

《羌在汉藏之间》是（）的作品。

A、王明柯

B、田余庆

C、唐长儒

D、胡适

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题型：多项选择题

2011年11月23日，朝韩军队炮火互攻后，美国航母驶向太平洋，美、韩、日连续举行黄海、东海军演。联合国秘书长潘基文呼吁朝韩双方保持克制，任何分歧应通过和平方式和对话解决。12月6日中国国家 * * 胡 * * 与美国总统奥巴马通电商讨局势时指出，对话谈判是解决朝鲜半岛问题及有关问题的唯一正确途径。面对半岛这一局面，中国正在尽一切努力阻止局势失控。

请运用有关知识，结合上述材料回答

上述材料体现了联合国的什么作用？

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