在如图的方格纸中，每个小方格都是边长为1个单位的正方形，△ABC的三个顶点都在格点上．（每个小方格的顶点叫格点）

（1）画出△ABC向下平移3个单位后的△A₁B₁C₁；

（2）画出△ABC绕点O顺时针旋转90°后的△A₂B₂C₂，并求点A旋转到A₂所经过的路线长．

现有浓度均为0.01mol•L^﹣1的下列溶液：①H₂SO₄   ②CH₃COOH  ③NaOH   ④Na₂CO₃

请回答下列问题：

（1）已知：T℃，K_W=1×10^﹣13，则T℃____ 25℃（填“＞”、“＜”或“=”），

T℃时，0.01mol•L^﹣1的NaOH溶液的pH=____ ．

（2）①②③④四种溶液中由水电离出的OH^﹣浓度由大到小的顺序是（填序号）____ ．

（3）将装有适量0.01mol•L^﹣1Na₂CO₃溶液（滴有2滴酚酞）的试管，分别进行如图操作：

（i） 说明滴有酚酞的Na₂CO₃溶液显红色的原因　____ （用离子方程式表述）．

（ii） 烧杯中加入NH₄NO₃晶体后，甲试管中溶液红色变浅，下列判断正确的是____ ．

a．水解反应为放热反应          b．水解反应为吸热反应

c．NH₄NO₃溶于水时放出热量    d．NH₄NO₃溶于水时吸收热量

（iii） 乙中观察到的现象是____ ．

（iv） 丙中产生红褐色沉淀同时冒出无色气泡，写出该反应的离子方程式　____ ．

 A teacher from a western country visited a school in an eastern country．In one class，she watched sixty children learn to draw a cat．The teacher drew a big circle on the blackboard, and sixty children copied it on their paper．The teacher drew a small one on the top of the big one and then put two small triangles(三角形)on the top of it．The children drew in the same way．The lesson wept on until there were sixty-one cats in the classroom．Each student's cat looked exactly the same as that on the blackboard．

 The visiting teacher watched the lesson and was surprised because the teaching methods were different from those in her country．A children's art lesson in her country produced a lot of pictures，and each one is quite different from the others．Why? What makes this difference in educational methods? In a classroom in any country, a teacher teaches more than art or history or language．

 In a country such as the United States or Canada，students are asked to work and find answers by themselves．The students are helped to learn to have their own ideas．In countries such as China and Japan，students often work together and help each other in the classroom，but the teachers teach，and the students listen．The students are asked to memorize a lot．They have to learn the same textbook；do the same homework and give the same answer．

苯与浓硝酸、浓硫酸制硝基苯的实验中，三种原料混合的顺序是 ____；要得到纯净的硝基苯，需经过：水洗→5% NaOH溶液洗涤→水洗→无水CaCl₂干燥→ ____（填写操作），得到纯硝基苯．