测量仪器中的主要轴系要求有固定的相互关系，如相互平行、垂直和共轴，并要求在运动过程中

阅读理解。

                                          Having Fun "Growing" and "Stealing" (偷)?

     Recently, an Internet game has become a new fashion among young office workers and students.

People can "farm" on a piece of "1and" and "grow", "sell" or even "steal" "vegetables", "flowers", and

"fruits" on the Net. They can earn (赚) some e-money and buy more "seeds", "pets", and even "houses".

     Joyce interviewed some young people. Here are their opinions.

     Harold: I don't quite understand why they are so mad about the childish game. Maybe they are just not

confident enough to face the real world.

     Allan: I enjoy putting some "bugs" (虫子) in my friends' gardens and we've become closer because of

the game. Having fun together is the most exciting thing about it.

     Laura: You know, people in the city are longing for (渴望) the life in the countryside. It reduces (减少)

my work pressure (压力); besides, it gives me the exciting experience of being a "thief".

     Ivy: Well, it's just a waste of time. Teenagers playing the game spend so many hours on it that they can

not focus on their study.

1. According to the passage, people can't ______ things in this game. [ ]

A. grow

B. borrow

C. steal

D. sell

2. Among the people Joyce interviewed, ______ likes the game while             dislikes the game. [ ]

A. Laura, Allan

B. Allan, Harold

C. Harold, Ivy

D. IVY, Allan

3. From Laura's words, we can guess that she's most probably ______. [ ]

A. a student

B. an office worker

C. a farmer

D. a thief

4. Which is NOT the reason why people like the game? [ ]

A. They are longing for country life.

B. They can have fun with friends.

C. The game can relax people and give them a new experience.

D. They are confident enough to face the real world.

5. Where can you find this passage? [ ]

A. In a car magazine

B. In an advertisement.

C. In a newspaper.

D. In a science book

“教育已经成为经济发展的杠杆，今天的教育是明天的经济”反映了现代教育的______特征。( )

A．公共性

B．未来性

C．生产性

D．科学性

周转时间－炭化室处理时间＝（）。

如图所示，在斜面倾角为θ的斜面底端，垂直斜面有一固定挡板．现有一质量为m（可视为质点）的物块以速度v₀从P点沿斜面下滑，已知物块与斜面间动摩擦因数为μ（μ＜tanθ），P点距离挡板距离为L，物块与挡板碰撞时无能量损失，不计空气阻力，则有关下列说法正确的是（　　）

A．物块第一次与挡板碰撞时的动能为mgLsinθ+

B．第一次与挡板碰后沿斜面上滑的最大距离一定小于L

C．从开始到物块静止，物块重力势能的减少量为mgLsinθ

D．物块在斜面上通过的总路程为

市场有效性的外生性将驱动市场价格趋于一致，同种商品在不同市场将遵循一价原则。