Welcome to Central Manchester high school（CMHS）

    CMHS has much more than you expect. We have a car park for both our visitors and our students who drive. We have 50 classrooms for different lessons, and a library with over 18,000 books. ⑴Twelve science labs are available for different experiments. Whether students want to exercise or just want some fun, they can use our gym. ⑵室内游泳池全年开放 for students who like swimming.

    Students who live far away from home will be happy with our dormitories. ⑶Each room comes with its own bathroom and Internet access. We have modem medical and experienced nurses. ⑷We make sure that we take good care of students on campus.

    School meals are delicious. Each day our canteen serves meals, and hamburgers and soft drinks are also available during break, tunes.

    ⑸我们希望你在 CMHS 享受你的生活. If you have any Questions or need any help, you can call the Students' Office any time during weekdays and on Saturday mornings.

The Student's Office

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2013年4月20日上午8点，我国四川雅安芦山县发生了7级地震．抢救现场利用各种探测仪寻找废墟下的生命迹象．其中二氧化碳探测仪适合用于狭窄的比较封闭的空间搜寻生命，当现场CO₂浓度上升到1100ppm（1.1%）以上时，探测仪报警．下列说法不正确的是（　　）

（Ⅰ）求证：a、b、c成等差数列；

（Ⅱ）若 $B=\frac{\pi }{3},S=8\sqrt{3}$ ，求b．