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问题 单项选择题

下列项目中，可以不招标的是( )。

A．大型基础设施项目

B．世界银行贷款项目

C．施工企业自建自用工程且该施工企业资质等级符合工程要求

D．国家融资项日

答案

参考答案：C

解析： 本题考点1Z301051。

听力题

根据课文填空（共10小题；每小题1分, 满分10分）

[A] Every year millions of people around the world die due to smoking. Every packet of cigarettes （66） __________poisonous chemicals that can result in lung cancer and heart disease. This costs countries a lot of money and causes great （67）__________to the welfare of the people. There are huge numbers of smokers in Asia. This is （68）_________we have chosen anti-smoking as the subjects of our ad campaign.

[B]The contemporary Olympics were first（69）__________in 1896, in Athens. It was a Frenchman, Pierre de Coubertin, who （70）__________the Olympics back to life. He dreamt that the Olympics would make it possible for people of all countries to live side by side in （71） __________. Now people all over the world are helping to （72） __________this dream. Among them are many well-known athletes.

[C]In scientific studies it has been shown that VR can be a good（73）_________for people who have social problems. In one case, a teenager who was（74）_________of talking and playing with his schoolmates was treated with VR. In the world created by RealCine, he became the captain of the Brazilian football team and scored the winning goal in a world cup final. This（75） ________him to become more confident around others.

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问答题

如图所示，质量为m的小物块（可视为质点）放在小车上，它们一起在两个竖直墙壁之间运动，小车质量为M，且M＞m，设车与物体间的动摩擦因数为μ，车与水平间的摩擦不计，车与墙壁碰撞后速度反向而且大小不变，切碰撞时间极短，开始时车紧靠在左面墙壁处，物体位于车的最左端，车与物体以共同速度V0向右运动，若两墙壁之间的距离足够长，求：

（1）小车与墙壁第2次碰撞前（物体未从车上掉下）的速度.

（2）要是物体不从车上滑落，车长l应满足的条件. （需经过计算后得出）
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