能源危机制约着现代社会的发展,开发和利用可再生能源是人类立足自身解决能源问题的重

题型:问答题

问题:

能源危机制约着现代社会的发展,开发和利用可再生能源是人类立足自身解决能源问题的重要举措之一.    

(1)目前;煤、石油、天然气等化石燃料成为最主要的能源. 它们的大量使用打破了生物圈中碳循环的平衡,使大气中        的含量迅速增加. 导致全球气温升高.    

(2)氢能源是我国正在开发的新能源之一.其使用的主要途径是设法构成原电池,从能量转换的角度看,原电池是一种               装置.转化为电能的

(3)环保汽车已为 2008年北京奥运会服务. 某辆以蓄电池为能源的环保汽车,总质量是1 000 kg;当它在水平路面上以一定速度匀速行驶时,驱动电机的输入电流为 20A,输入电压为 50 V,在此状态下. 驱动电机的输入功率为        W. 设想改用太阳能电池给该车供电,所需的太阳能电池板的面积至少应为        m2. (按阳光垂直照射时. 地球表面每平方米面积上每秒内可获得800 J 的能量,太阳能电池的转换效率为 20%计算)

(4)人类社会的不断进步. 必然会带来新一 轮的能源革命. 未来的新能源要能够大规模替代煤、石油、天然气等常规的、不可再生的能源. 从理想的角度考虑,它必须满足许多条件,如:必须足够丰富. 可以保证长期使用;必须足够便宜. 可以保证多数人用得起;相关的制备、应用技术必须成熟,可以保证大规模使用等,除此之外,你认为还必须满足什么条件?试写出一条                                                     .

考点:未来的理想能源能源家族:化石能源,一次能源,二次能源,生物质能,不可再生能源,可再生能源有利于节约能源的措施
题型:问答题

买回来的蔬菜,最好在清水中浸泡(),这样可除掉大部分残留农药。

A.30-60分钟

B.1-5分钟

C.5-10分钟

题型:问答题

If there’s one memory Anna wanted to keep from her experiences during the Second World War, it was her son, Andrzej. Anna, 89, lost touch with him when she was forced to leave her native Poland and sent to a labor camp in Austria more than 60 years ago. Now, 64, Andrzej hugged his mother at the air port, who had been waiting for him.

Andrzej searched for his mother for more than 50 years, almost giving up. But his mother made the first phone call. Unluckily, he wrote down his mother’s phone number wrong and spent another month trying to reach her again. When he did, the two talked regularly on the phone for two months to break down the language barrier. Anna can hardly speak Polish over the years and Andrzej doesn’t speak English.

After the war, Anna could not find her son and went to Italy, finally ending up in Great Britain, the US, then Canada 45 years ago. She used the Internet to track her son, making phone calls with no luck. Meanwhile Andrzej contacted the Polish Red Cross last year to help in his search.

At last, they locate each other at the same time. Andrzej will spend a month with his mother in Britain.

小题1:Andrzej was about _______ years old when his mother left him for Austria 60 years ago.

A.eight

B.six

C.four

D.two小题2:Where did they meet for the first time after 60 years separation?

A.In Britain

B.In Italy

C.In Poland

D.In Canada小题3:Andrzej delayed a month to phone his mother because________.

A.he had to learn English first

B.he put down a wrong number

C.he needed some time to prove the news

D.he just couldn’t believe the news at first小题4:The best title for the passage would be ________

A.The story of Anna and her son Andrzej

B.The war separated the families for 60 years

C.Anna suffered a great deal from the war

D.Mother reunited with son after 60 years.

题型:问答题

大豆中产生豆腥味的主要酶类是().

A.淀粉酶

B.脂肪氧化酶

C.尿酶

D.蛋白酶

题型:问答题

根据公司法律制度的规定,下列各项中,属于有限责任公司股东会的职权的是( )。

A.决定公司的经营计划和投资方案
B.选举和更换全部监事
C.对发行公司债券作出决议
D.对股东向股东以外的人转让出资作出决议

题型:问答题

在简单国民收入决定模型中,储蓄越多国民收入越多。

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