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Political systems
The organisation and interaction of the members that make up the governing power of a social community or state.
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Chemistry; General chemistry
具有原子數 43 化學元素和符號 Tc。 是最低的原子序數元素，而任何不穩定同位素 ； 每個表單，它的放射性。幾乎所有鍀綜合都生產和只有少量在大自然中找到。 ...
