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混有空气或氧气的氢气遇到明火时可能会发生爆炸．使用氢气时，要注意安全，点燃前一定要 ______
混有空气或氧气的氢气遇到明火时可能会发生爆炸．使用氢气时，要注意安全，点燃前一定要 ______
2025-03-16 00:34:34
推荐回答（1个）
回答1：
凡是可燃性气体混有空气或氧气遇到明火时可能会发生爆炸．所以使用氢气时，也要注意安全，点燃前一定要验纯．
故答案为：验纯
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