如图为学校配电房向各个教室的供电示意图，T为理想变压器，V₁、A₁为监控市电供电端的电压表和电流表，V₂、A₂为监控校内变压器的输出电压表和电流表，R₁、R₂为教室的负载电阻，V₃、A₃为教室内的监控电压表和电流表，配电房和教室间有相当长的一段距离，则当开关S闭合时（）

苏东坡说：腹有诗书气自华。一个人，当他热爱阅读，达到一种至高无上的境界时，内在的精神就会纯净如水，外露的气质自然而然的让人感到舒适、淡雅。这说明（    ）

下列化合物中，化学键的类型和分子的极性(极性或非极性)皆相同的是(　　)

阅读短文并选择正确答案。
    Helen is an English schoolgirl. She is now in Nanjing with her parents. She doesn't know Chinese. She often tries to speak Chinese to her Chinese friends. Sometimes they don't understand(理解) her, because she can't speak Chinese well.
    It's a Sunday morning. Helen wants to go to Zhongshan park. She is going there to see a flower show(展览). But she doesn't know how to go there. She asks a Chinese boy. The boy can't understand her. Then she takes out a pen and some paper. She draws a park and some flowers on it and gives the picture to the boy and says something about it. The boy smiles and then shows Helen the way to the park.

下列实验方案中错误的是（    ）

序号	实验目的	实验方案
A	除去KCl固体中的K2CO3	加入过量的稀盐酸，蒸发结晶
B	鉴别NH4Cl和KCl两种白色固体肥料	加入熟石灰研磨后闻气味
C	除去N2中的O2	缓缓通过灼热铜丝网
D	除去CO2中的HCl气体	通入足量NaOH溶液