如图，在平面直角坐标系xOy中，已知椭圆 $\frac{x^2}{a^2}+\frac{y^2}{b^2}=1$ （a＞b＞0）的离心率为 $\frac{\sqrt{2}}{2}$ ，焦点到相应准线的距离为1．

如图所示的扇形是一个圆锥的侧面展开图，若∠AOB=120°，弧AB的长为12πcm，则该圆锥的侧面积为____ cm²．

在图中，根据小磁针静止时指向，在对应位置标出通电螺线管N极和电源“+”极．

阅读理解
     Comedy King Stephen Chow's upcoming film 'The Mermaid' has released its first trailer（预告片）.
     Actor Deng Chao, who plays the leading role in this film, appeared in the trailer by reporting his findings of a mermaid to the police.
    A series of hand-painted posters by the director come out along with the trailer.
    Set plot（情节） in the modern world, the film describes the story of a biological professor, who was saved by a mermaid, and then falls in love with the mermaid.
    So far, the film has unveiled（公开） its first official poster, with a photo of crashing waves, the title, and the director's name.
    The film also stars Kris Wu, Show Luo, and the new-face actress Lin Yun as the titular character.
    'The Mermaid' is scheduled to be released during China's Lunar New Year, on February 8th.

下面是某同学配制100g质量分数为15%的氯化钠溶液的主要过程．