Stay Fitness Club—the Club with a Difference

Get off the sofa! It's summer! Let's spring into action! We want to help you get fit and stay fit.

Join our fitness club and become a member. Then, you can enjoy our classes for free. You can enroll（注册） for as many classes manage.

We offer classes in:

Yoga

Indoor cycling

Dancing

Taekwondo

Chinese kong fu

We also have fantastic facilities（设施）：

Machines—They use the very latest technology.

Changing room—There are excellent showers and lockers to keep your things safe.

Lounge area—You can relax and enjoy a cooling drink and a healthy snack.

The membership fee（会费）is very low. You can pay weekly or monthly. It is up to you. When you have paid the fee, you can come as often as you want. Our friendly staff（工作人员）will be glad to answer your questions.

Come to Stay Fitness Club. You are never too old or too young to start a fitness programme.

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①画出将△ABC向上平移3个单位后得到的△A₁B₁C₁；

②画出将△A₁B₁C₁绕点C₁按顺时针方向旋转90°后所得到的△A₂B₂C₁．

为研究化学反应前后反应物与生成物之间的质量关系，三位同学分别做了三个实验：

实验一：称量镁条，点燃，待反应结束后，再称量；

实验二：将盛有稀盐酸的小试管放入装有锌粒的烧杯中，称量，然后将盐酸倒入烧杯与锌粒接触，充分反应后再称量剩余物质及仪器；

实验三：将盛有氢氧化钠溶液的试管，放入盛有硫酸铜溶液的锥形瓶中，称量，然后使两种溶液混合，充分反应，再称量反应后的物质及仪器．三位同学得到的实验数据如下表：

（1）根据表中数据，实验一，反应后物质的质量比原镁条的质量（填“增大”、“减小”或“不变”）

____ ；造成上述结果的原因可能是____ 

（2）实验二的现象为____ 

（3）在三个实验的数据中，实验____ 的数据正确地反应了反应物与生成物之间的质量关系；写出该反应的化学方程式____ 

如果转动200次，估计指针落在蓝色区域有多少次呢？