混凝土桥梁挠度测量与钢梁挠度测量方法相同。

如图10所示，利用皮带运输机将物体由地面运送到高出水平地面的C平台上，C平台离地面的竖直高度为5m，已知皮带和物体问的动摩擦因数为0.75，运输机的皮带以2m／s的速度匀速顺时针运动且皮带和轮子之间不打滑（g=l0m/s²，sin37°=0.6）。

（1）假设皮带在运送物体的过程中始终是张紧的。为了将地面上的物体能够运送到平台上，皮带的倾角θ最大不能超过多少?  

（2）皮带运输机架设好之后，皮带与水平面的夹角为θ=30°，现将质量为l kg的小物体轻轻地放在皮带的A处，运送到C处．试求所需要的时间是多少？

Have you heard of the scandal that happened in one of Great Britain’s biggest supermarket chains called Tesco? The British love Tesco as it sells very cheap products and it can be found on almost every corner of a British city or town.

On January 15th 2013 food inspectors discovered 30 % horsemeat in a certain brand of frozen beefburgers that were mostly sold by Tesco in the UK and Ireland.

In times of social media like Facebook and Twitter the news has spread fast and customers have been very concerned about what the food they buy actually contains. Tesco said it had taken away the burgers from the shop shelves immediately, and apologized to their customers. They also promised that they would find out what exactly happened and that they would work harder than ever so this would never happen again. Customers are also able to return the beefburgers and get a refund, that is, their money back.

However, it will be hard for Tesco to get the people’s trust back. Just imagine buying lovely beefburgers that you fry at home and suddenly you find out that you have actually eaten horsemeat! In this case not only horse lovers will be upset!

By the way, why are British people so shocked about eating horsemeat? In history, horses have played great roles as working animals and as an important means of transport. When Britons of today think of horses, they think of majestic animals or cute pets rather than meat.

But this is not the only reason for the protest: Customers also want to be sure that the products they buy contain what it says on the label. Hopefully, supermarkets can avoid mistakes like that in the future. Maybe there should be stricter regulations and more controls of our food? Otherwise we will soon find ourselves eating panda meat instead of pork and parrot instead of chicken. So the next time you are in a supermarket maybe check the ingredients of your food before you buy it or you could get a nasty surprise …

小题1:What is the scandal?

A．Tesco’s products were much more expensive than they are supposed to be.

B．Tesco didn’t react immediately to a food quality issue.

C．Tesco sold expired food.

D．Horsemeat was found in burgers sold in Tesco.小题2:What didn’t Tesco do in response to the scandal?

A．It withdrew the beefburgers.

B．It made an apology to the public.

C．It investigated and found out the cause and effect of the scandal.

D．It returned money to customers who bought the beefburgers.小题3:Which statement isn’t among the reasons why customers are furious?

A．People trusted Tesco so much that they never expected a scandal like this.

B．Everyone can call himself or herself a horse lover in the UK.

C．Sellers shouldn’t cheat customers.

D．The horse is humans’ friend.

（）提醒人们对安全因素的注意、防止发生事故、保障安全的图形标识。

A.警告标识

B.提示性标识

C.公共信息标识

D.禁止标识

突然短路事故

关于施工总承包和施工总承包管理的说法，正确的有（）。

A.施工总承包管理单位只收取总包管理费，不赚取总包与分包之间的差价

B.施工总承包招标和施工总承包管理招标均可以不依赖完整的施工图

C.业主在施工总承包和施工总承包管理模式下，对分包单位的选择和认可权限是相同的

D.施工总承包管理单位负责施工现场的总体管理和协调，对项目目标控制不承担责任

E.施工总承包管理模式下，工程实体不得由施工总承包管理单位化整为零，分别进行分包