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  3. What proportion of the world’s electricity supply is provided by hydroelectric power? How far water drops to the turbines in a

What proportion of the world’s electricity supply is provided by hydroelectric power? How far water drops to the turbines in a

admin2009-08-19  51
问题 What proportion of the world’s electricity supply is provided by hydroelectric power?
How far water drops to the turbines in a power station is known as ______ .
选项 A、the heads
B、the flow rate
C、the vertical distance
D、the heights
答案A
解析 本题考查水落到涡轮的垂直距离的学名，故将答案出处定位到第五段。该段介绍了决定发电站的发电量的两个因素：the“head”和the flow rate。其中对the“head”作了解释：the vertical distance that the water falls, called the“head”，指出水落下的垂直距离称为“水头”，其中题干中的How far water drops to the turbines是对the vertical distance that the water falls的同义转述，故[A]为答案。
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