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【简答题】How much food, fresh
water and energy is predicted to be used in the future?
【简答题】How much energy is wasted before it arrives to fuel a desk lamp（）
【简答题】How much do energy drinks sell for?
【简答题】已知函数 （1）若 的定义域是 ,求实数 的取值范围及 的值域； （2）若 的值域是 ，求实数 的取值范围及 的定义域
【简答题】We do not often consider how much energy goes into creating comforts like hot showers and cold beer. A more efficient refrigerator will give us the same cold beer while using less energy. A more water...
【单选题】How much energy could 1 recycled tin can save? ( )
A.
Enough to power a cell phone for 18 hours.
B.
Enough to power a TV for 3 hours.
C.
Enough to power lamp for 6 hours.
D.
Enough to power a TV for 6 hours.
【简答题】若函数 的值域是 ，则函数 的值域 是
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