初一某一班决心把本班建设成为初一年级的“领头雁”，你认为一个班级里团结奋斗的不懈动力是（    ）

阅读填空。

    Edison had quick mind about inventions, but not always about other things.

    One day he received a notice. It said he must pay some money to the government by the next day. If he was late, ____. Edison went to the city office. Many people were waiting there in line to pay. ____, his mind was busy with ideas about a new invention. ____, the man behind it said to Edison “Young man, what's your name?”

    Edison looked at the man in surprise. “ I don't know,” he said.

    “Then I can't help you,” the man said, and told him to leave.

    Other people paid the money, but Edison stood there, and tried to remember his name. The day ended, ____.

    In the street, ____. He had to ask the friend what his name was.

如图所示，M为一线圈电阻r_M=1Ω的电动机，定值电阻R=5Ω，电源电动势E=12V．当S闭合时，电压表的示数为U₁=10.0V，当开关S断开时，电压表的示数为U₂=5.0V．求：

将$y=\tan \left(\omega x+\frac{\pi }{4}\right)\left(\omega >0\right)$的图像向右平移$\frac{\pi }{6}$个单位长度后，与$y=\tan \left(\omega x+\frac{\pi }{6}\right)$的图像重合，则$\omega$的最小值为（   ）

秦朝建立后，秦始皇自称为“朕”，皇帝的命称为“制”，令称为“诏”，印信称为玺，只有玺才能使用玉料，这些都是皇帝专用的，其它人不得使用，这从根本上说明了                                                           (　　)