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___是允许在运营分公司所辖设备和范围内进行施工的一种凭证。
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【简答题】从能量利用的角度，简要说明热泵供暖与电加热器取暖的优势。
【简答题】My father was in the navy, which meant that my mother was married to both my father and the sea．As was often the case, we had to pack our belongings into boxes and 31 those we had grown to love．We wou...