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BloombergNEF said that green hydrogen will fall from its current price range of $3.74/kg to $11.70/kg to between $1.60/kg and $5.09/kg by 2050, citing higher-than-expected future costs for ...

1． 水封 ：在中学化学实验中，液溴需要水封，少量白磷放入盛有冷水的广口瓶中保存，通过水的覆盖，既可隔绝空气防止白磷蒸气逸出，又可使其保持在燃点之下；液溴极易挥发有剧毒，它在水中溶解度较小，比水重，所以亦可进行水封减少其挥发。

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