打倒列强！打倒列强！除军阀，除军阀！国民革命成功，国民革命成功！齐欢唱，齐欢唱！这首军歌反映的历史事件是什么？这一事件能够胜利的原因是什么？

在下图经纬网图中，既位于北半球，又位于西半球的有（   ）

阅读下列短文，从每题所给的四个选项（A、B、C、D）中选出最佳选项。

Mr. Lewis was a dance teacher. He was a nice man and always had a lot of students. One year he moved to a new town, and was soon teaching many students in the dance school there, but he decided to move again to a big city. He would have more work there.

    When one of his students heard that he was going to leave, she said to him, "The new teacher won't be as good as you are." Mr. Lewis was happy when he heard this, but he said, "Oh no. I'm sure he'll be as good as I am ---- or even better." The student said, "No. Five teachers have come and gone while I've been here, and each new one was worse than the last."

超声波加湿器通电工作时，雾化片产生每秒170万次的高频率振动，将水抛离水面雾化成大量1μm～5μm的超微粒子（水雾），吹散到空气中使空气湿润，改变空气的湿度。图甲所示是某型号超声波加湿器，下表为其部分技术参数，其中额定加湿量是指加湿器正常工作1h雾化水的体积；循环风量是指加湿器正常工作1h通过风扇的空气体积；加湿效率是指实际加湿量和实际输入功率的比值。