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据人民网报道,有一集团拟将在太空建立巨大的激光装置,把太阳光变成激光用于分解海水制氢,其反应可表示为: 2H 2 O 2H 2 ↑ + O 2 ↑ 。有下列几种说法: 1 水分解反应是放热反应; 2 氢气是一级能源; 3 使用氢气作燃料有助于控制温室效应; 4 若用生成的氢气与空气中多余的二氧化碳反应生成甲醇储存起来,可改善生存条件。其中叙述正确的是 ( )A.
①②
B.
②③
C.
③④
D.
①②③④
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