根据以及首字母提示补全所缺单词 1.My father usually works in the day and sometimes he works at n___.

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• 根据以及首字母提示补全所缺单词 1.My father usually works in the day and sometimes he works at n___.
• 根据以及首字母提示补全所缺单词 1.My father usually works in the day and sometimes he works at n___.
• 因式分解：
• 检验谋气体中是否由CO,H2,现有氢氧化钠溶液,石灰水,灼热氧化铜,无水硫酸铜,浓硫酸