Cautiously add, dropwise, 30 percent hydrogen peroxide, allowing the reaction to subside and again heating between drops.
逐滴小心地加入30%的过氧化氢，每加一滴均要等反应平息后再次加热。
Cautiously add, dropwise, 30 percent hydrogen peroxide, allowing the reaction to subside and again heating between drops.
逐滴小心地加入30%的过氧化氢，每加一滴均要等反应平息后再次加热。
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