单词：hydroxide ion concentration
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Psychologically defined, concentration is the process of centering one's attention over a period of time. In practical application, however, concentration is not as simple to deal successfully with as the definition may imply. For this reason, it is
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It is cold, so bitter cold, on this dark, winter day in 1942. But it is no different from any other day in this Nazi concentration camp. I stand shivering in my thin rags, still in disbelief that this nightmare is happening. I am just a young boy. I
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