如果下水管管道堵塞了，我们可以用一种主要成分为氢氧化钠和铝片的管道疏通来疏通，反应原理为2Al+2NaOH+2H2O═2NaAlO2+3H2↑．现有一盒500g含烧碱为80%的管道通在疏通管道时全部使用并完全反应，则一盒管道通充分反应完消耗铝的质量为多少？
解：设一盒管道通充分反应完消耗铝的质量为x
2Al+2NaOH+2H2O═2NaAlO2+3H2↑
54 80
x 500g×80%
5480=x5
Car Services
Bring your car into Car Services today！We will clean your car and repair your engine at very reasonable prices. Drive your car into our workshop located at Xinhua Road, or make an appointment.
Tel:7195638
Car Washing: ¥10
Engine Repairing: Only ¥180
Tyre (轮胎) Servicing: ¥15 for each
The building which saves people from bad weather.
This building near the sea in New Orleans looks like something from a scifi film (科幻电影). It is over 360 meters high, and is designed to house up 40,000 people, named the Noah. This building is strong enough to avoid the damages of bad weather.
Beach Cleanup Day
We need volunteers to clean the beach！
Sunday, July 20
Meet at 8:30 a.m. at Coast Square.
Start at 9:00 a.m. and end at noon.
Bring bags and gloves.
For more information, call Zhang Lin at 564-0657.
Apartment to Rent (出租)
A new apartment to be rented in the city centre. One bedroom and one kitchen. Near the bus station, at No. 22 Changjiang Road. Buses pass the front gate.
If you are interested, please have a look at the apartment or you can call Mrs. Yu at 2747130.
建党90多年来，***领导全国各族人民取得了举世瞩目的伟大成就，一个欣欣向荣的社会主义中国正在科学发展的道路上奋勇前进。实现党和国家科学发展的政治保证是（ ）。
下列说法正确的是（ ）
