双螺形水轮机

英国学生科学读本第88期:冷凝(2)

Thus by heating liquids we cause them to evaporate, or change into vapours or gases; 因此, 可以看出：我们能够通过加热液体使得它们蒸发, 变成水蒸气或气体； and by taking away heat from these gases, or cooling them, we tu

发表于:2018-12-18 / 阅读(37) / 评论(0)

英国学生科学读本

AGRICULTURE REPORT - Using Water to Produce Electricity

AGRICULTURE REPORT - Using Water to Produce Electricity By Gary Garriott Broadcast: Tuesday, May 04, 2004 This is the VOA Special English Agriculture Report. The power of flowing water can be used to

发表于:2019-01-04 / 阅读(79) / 评论(0)

农业与发展

VOA标准英语2010年-Florida Man Installs Wind Turbine on H

Amid the recent economic downturn, demand in the U.S. is rising for small wind turbines to power people's homes. The American Wind Energy Association says sales of such turbines rose 15 percent in 2009. One man in Florida is generating his own power

发表于:2019-01-04 / 阅读(65) / 评论(0)

VOA标准英语2010年(六)月

Bird-friendly Bladeless Wind Turbine Mimics Nature

Bird-friendly Bladeless Wind Turbine Mimics Nature Energy created by conventional three-blade wind turbines is cheap, sustainable and pollution-free. But according to current estimates, the devices' fast-moving blades kill up to 300,000 birds annuall

发表于:2019-01-14 / 阅读(90) / 评论(0)

VOA标准英语2015年(十一月)

VOA标准英语2014--Israeli, Palestinian Farmers in Jordan Valley Face Twin Crises

Israeli, Palestinian Farmers in Jordan Valley Face Twin Crises JERUSALEM Hannan Pasternak is a worried man. Pasternak coordinates the Netiv Hagedud cooperative of some 60 Jewish families who farm plots of about eight hectares each on this settlement

发表于:2019-01-14 / 阅读(28) / 评论(0)

VOA标准英语2014年(三月)

VOA常速英语2008年-US Researchers Hope to Tap Ocean Flows for Elec

By Brian Wagner Key West, Florida 06 March 2008 Researchers in the United States are set to begin testing underwater turbine systems that can produce electricity from ocean water flows. The projects in Florida are the latest efforts to find alternati

发表于:2019-02-05 / 阅读(44) / 评论(0)

VOA标准英语2008年（三月）

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