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【简答题】
标准煤的热值为2.93×10 7 J/kg，1950年全世界能源消耗是2.6×10 10 t标准煤，消耗能量约为______J．2000年消耗能源超过2.00×10 11 t标准煤，消耗能量超过______J．
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presentation n. 提交; 演出; 陈述，报告;
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complain vi. 抱怨，诉苦; 申诉，控诉，抗议;vt. 诉说，申诉，控告;
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A.
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B.
the 1940’s, his forties
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1940’s, his forties
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【简答题】In 1940 Hughes published______.
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