water polarity with negative and positive charged ends
化学反应动力学 average velocity it the nuclear atom a3 is
雷雨云的雷达回波图及电荷分部图★雷暴的威胁atom「刻(ke)林四(si)
华中科技大学取得抗肿瘤纳米药物递送系统方面新进展
electric volt (mev) of energy, producing two oppositely charged
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