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寒假要求同学完成的作业有( )。
选项: A:自我介绍; B:提供变压器照片不少于5张; C:提交关于向量、相量和矢量的小论文1篇; D:完成小测验
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变压器新投运前,应做( )次冲击合闸试验。 A.5 B.4 C.3 D.2
选项: A:A.5 B.4 C.3 D.2 B:A.5 B.4 C.3 D.2 C:A.5 B.4 C.3 D.2 D:A.5 B.4 C.3 D.2
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变压器有什么用处?
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什么是变压器?有什么用途?
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<span style="font-size:14px;font-family:'Calibri',sans-serif">CRH380B</span><span style="font-size:14px;font-family:宋体">型动车组变压器的寿命约为</span>
选项: A:<p><span style="font-size:14px;font-family:'Calibri',sans-serif">20</span><span style="font-size:14px;font-family:宋体">年</span></p> B:<p><span style="font-size:14px;font-family:'Calibri',sans-serif">30</span><span style="font-size:14px;font-family:宋体">年</span></p> C:<p><span style="font-size:14px;font-family:'Calibri',sans-serif">40</span><span style="font-size:14px;font-family:宋体">年</span></p> D:<p><span style="font-size:14px;font-family:'Calibri',sans-serif">50</span><span style="font-size:14px;font-family:宋体">年</span></p>
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<span style="font-size:14px;font-family:'Calibri',sans-serif">CRH380B</span><span style="font-size:14px;font-family:宋体">型动车组变压器有几个牵引绕组</span>
选项: A:<p><span style="font-size: 14px; font-family: Calibri, sans-serif;">3</span><span style="font-size: 14px; font-family: 宋体;">个</span></p> B:<p><span style="font-size:14px;font-family:'Calibri',sans-serif">4</span><span style="font-size:14px;font-family:宋体">个</span></p> C:<p><span style="font-size:14px;font-family:'Calibri',sans-serif">5</span><span style="font-size:14px;font-family:宋体">个</span></p> D:<p><span style="font-size:14px;font-family:'Calibri',sans-serif">6</span><span style="font-size:14px;font-family:宋体">个</span></p>
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<span style="font-size:14px;font-family:'Calibri',sans-serif">CRH380A</span><span style="font-size:14px;font-family:宋体">型动车组,牵引变压器在(</span><span style="font-size: 14px;">&nbsp; &nbsp;</span><span style="font-size:14px;font-family:宋体">)车。</span>
选项: A:<p><span style="font-size:14px;font-family:'Calibri',sans-serif">M1</span></p> B:<p><span style="font-size:14px;font-family:'Calibri',sans-serif">M2</span></p> C:<p><span style="font-size:14px;font-family:'Calibri',sans-serif">M3</span></p> D:<p><span style="font-size:14px;font-family:'Calibri',sans-serif">M4</span></p> E:<p><span style="font-size:14px;font-family:'Calibri',sans-serif">M5&nbsp;</span></p> F:<p><span style="font-size:14px;font-family:'Calibri',sans-serif">M6</span></p>
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什么叫变压器?它有什么用处?
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[问答题] 变压器有什么用处?
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变压器有什么用途?