磨煤机堵煤的现象:磨煤机进出口差压(),出口温度()。

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磨煤机堵煤的现象:磨煤机进出口差压(),出口温度()。

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下图是我国某地的一个人工农业生态系统模式图,它利用鸭旺盛杂食性,吃掉稻田里杂草和害虫,用水稻养猪、养鸭,水稻秸秆可以培育蘑菇、生产沼气,猪鸭粪、沼渣肥田.请据图分析回答:

(l)杂草在该生态系统中属于   ,它可以通过     作用制造       ,并将太阳能转化为       贮存起来;蘑菇在该生态系统中属于    ,它在生态系统中的作用是                                          ;鸭在该生态系统中属于第    营养级。

(2)能量在各种生物之间以         的形式进行传递;碳在生物体与无机环境之间以          的形式进行循环。

(3)人们设计这一生态系统的主要目的是使能量最终流向                  

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Passage 2 A Different Consensus Even as the U.S. Senate debates a vast new tax and spend regime in the name of fighting climate change, a more instructive argument was taking place in Copenhagen, Denmark. Some of the world’s leading economists met earlier this month to decide how to do the most good in a world of finite resources. Scarcity is a core economic concept. There isn’t an unlimited amount of money to be spent on every problem, so choices have to be made. The question addressed by the Copenhagen Consensus Center is what investments would do the most good for the most people. The center’s blue-ribbon panel of economists, including five Nobel laureates, weighed more than 40 proposals to improve the world by spending a total of $75 billion over the next four years. What would do the most good most economically Supplements of vitamin A and zinc for malnourished children. Number two A successful outcome to the Doha Round of global flee-trade talks. Global warming mitigation It ranked 30th, or last, right behind global warming mitigation research and development. On the benefits of freer trade, it was estimated that a successful Doha Round could generate up to $113 trillion in new wealth during the 21st century, at a cost of $420 billion or less from inefficient industries going bust. Meanwhile, providing vitamin A and zinc would help some 112 million children in sub-Saharan Africa and South Asia for merely $60 million a year. The minerals would help prevent blindness and stunted growth—increasing lifetime productivity by an estimated $1 billion. Similar if not quite so bountiful returns apply to investments in iron supplements, salt iodization and deworming, all low-cost measures that the economists in Copenhagen ranked highly.

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现代通信技术能够使人与人之间的信息交流不受时间和地理位置的限制

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如图,以下两个常见的图片反映当今社会发展的趋势是(  )

           

A.经济全球化和信息网络化

B.经济区域化和信息网络化

C.经济区域化和世界格局多极化

D.知识经济化和信息网络化

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再保险合同是原保险人和再保险人之间签订的正式的、有法律效力的文件,其形式( )。

A.必须是法律文本形式
B.可以是一般书面形式
C.可以是口头形式
D.可以是书面或口头形式

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