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例4 在真空中,一个电荷量为 2.0×10–9 C 的点电荷 q ,受到另一个点电荷Q 的吸引力为 8.1×10-3 N, q 与Q 间的距离为 0.1 m , 求Q 的电荷量。
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【简答题】SECTION C NEWS BROADCAST In this section, you will hear several news items. Listen to them care fully and then answer the questions that follow. Questions 21 and 22 are based on the following news. At...
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【单选题】α - 螺旋是蛋白质二级结构的一种类型,也称 3.6 13 螺旋,其中的数字 13 表示
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A.
链内気键稳定其结构
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